Régulateur d'alternateur METZGER 2390034

RENAULT MEGANE I Coupé (DA0/1_) 2.0 16V (DA0H) Coupé F7R 710 | F7R 714

RENAULT MEGANE I Classic (LA0/1_) 1.9 dTi (LA08, LA0N) A trois volumes F9Q 730 | F9Q 734 | F9Q 731 | F9Q 736

RENAULT MEGANE I Classic (LA0/1_) 1.9 dTi (LA08, LA0N) A trois volumes F9Q 730 | F9Q 734 | F9Q 731 | F9Q 736

RENAULT MEGANE I Coupé (DA0/1_) 1.9 dTi (DA0N) Coupé F9Q 734 | F9Q 731 | F9Q 736

RENAULT KANGOO (KC0/1_) D 55 1.9 (KC0D) Monospace F8Q 662

RENAULT KANGOO (KC0/1_) D 65 1.9 (KC0E, KC02, KC0J, KC0N) Monospace F8Q 630 | F8Q 632

RENAULT LAGUNA I (B56_, 556_) 1.9 dTi (B56J) 3/5 portes F9Q 710 | F9Q 716 | F9Q 717

RENAULT LAGUNA I Nevada (K56_) 1.9 dTi (K56J) Break F9Q 710 | F9Q 716 | F9Q 717

RENAULT LAGUNA I Estate (K56_) 1.9 dTi (K56J) Break F9Q 710 | F9Q 716 | F9Q 717

RENAULT CLIO Mk II (BB_, CB_) 1.6 16V (BB01, BB0H, BB0T, BB14, BB1D, BB1R, BB2KL, BB3G... 3/5 portes K4M 748 | K4M 708 | K4M 740 | K4M 744 | K4M 745 | K4M 742 | K4M 743

RENAULT LUTECIA II (BB_, CB_) 1.6 16V (BB01, BB0H, BB0T, BB14, BB1D, BB1R, BB2KL, BB3G... 3/5 portes K4M 748 | K4M 708 | K4M 740 | K4M 744 | K4M 745 | K4M 742 | K4M 743

RENAULT CLIO MIO II (BB_, CB_) 1.6 16V (BB01, BB0H, BB0T, BB14, BB1D, BB1R, BB2KL, BB3G... 3/5 portes K4M 748 | K4M 708 | K4M 740 | K4M 744 | K4M 745 | K4M 742 | K4M 743

RENAULT CLIO II (BB_, CB_) 1.6 16V (BB01, BB0H, BB0T, BB14, BB1D, BB1R, BB2KL, BB3G... 3/5 portes K4M 748 | K4M 708 | K4M 740 | K4M 744 | K4M 745 | K4M 742 | K4M 743

RENAULT CLIO Mk II (BB_, CB_) 1.6 16V (BB01, BB0H, BB0T, BB14, BB1D, BB1R, BB2KL, BB3G... 3/5 portes K4M 748 | K4M 708 | K4M 740 | K4M 744 | K4M 745 | K4M 742 | K4M 743

RENAULT LUTECIA II (BB_, CB_) 1.6 16V (BB01, BB0H, BB0T, BB14, BB1D, BB1R, BB2KL, BB3G... 3/5 portes K4M 748 | K4M 708 | K4M 740 | K4M 744 | K4M 745 | K4M 742 | K4M 743

RENAULT CLIO MIO II (BB_, CB_) 1.6 16V (BB01, BB0H, BB0T, BB14, BB1D, BB1R, BB2KL, BB3G... 3/5 portes K4M 748 | K4M 708 | K4M 740 | K4M 744 | K4M 745 | K4M 742 | K4M 743

RENAULT CLIO II (BB_, CB_) 1.6 16V (BB01, BB0H, BB0T, BB14, BB1D, BB1R, BB2KL, BB3G... 3/5 portes K4M 748 | K4M 708 | K4M 740 | K4M 744 | K4M 745 | K4M 742 | K4M 743

RENAULT CLIO Mk II (BB_, CB_) 1.6 16V (BB01, BB0H, BB0T, BB14, BB1D, BB1R, BB2KL, BB3G... 3/5 portes K4M 748 | K4M 708 | K4M 740 | K4M 744 | K4M 745 | K4M 742 | K4M 743

RENAULT LUTECIA II (BB_, CB_) 1.6 16V (BB01, BB0H, BB0T, BB14, BB1D, BB1R, BB2KL, BB3G... 3/5 portes K4M 748 | K4M 708 | K4M 740 | K4M 744 | K4M 745 | K4M 742 | K4M 743

RENAULT CLIO MIO II (BB_, CB_) 1.6 16V (BB01, BB0H, BB0T, BB14, BB1D, BB1R, BB2KL, BB3G... 3/5 portes K4M 748 | K4M 708 | K4M 740 | K4M 744 | K4M 745 | K4M 742 | K4M 743

RENAULT CLIO II (BB_, CB_) 1.6 16V (BB01, BB0H, BB0T, BB14, BB1D, BB1R, BB2KL, BB3G... 3/5 portes K4M 748 | K4M 708 | K4M 740 | K4M 744 | K4M 745 | K4M 742 | K4M 743

RENAULT KANGOO Rapid (FC0/1_) D 55 1.9 (FC0D) Camionnette/Monospace F8Q 662

RENAULT KANGOO Rapid (FC0/1_) D 65 1.9 (FC0E, FC02, FC0J, FC0N) Camionnette/Monospace F8Q 630 | F8Q 632

RENAULT KANGOO Rapid (FC0/1_) D 65 1.9 (FC0E, FC02, FC0J, FC0N) Camionnette/Monospace F8Q 630 | F8Q 632

RENAULT LAGUNA I (B56_, 556_) 1.8 16V (B563, B564) 3/5 portes F4P 760 | F4P 770

RENAULT LAGUNA I (B56_, 556_) 1.8 16V (B563, B564) 3/5 portes F4P 760 | F4P 770

RENAULT LAGUNA I Nevada (K56_) 1.8 16V (K563, K564) Break F4P 760

RENAULT LAGUNA I Estate (K56_) 1.8 16V (K563, K564) Break F4P 760

RENAULT LAGUNA I Nevada (K56_) 1.6 16V (K568) Break K4M 720 | K4M 724

RENAULT LAGUNA I Estate (K56_) 1.6 16V (K568) Break K4M 720 | K4M 724

RENAULT ESPACE Mk III (JE0_) 2.0 16V (JE0N, JE0L, JE02) Monospace F4R 700 | F4R 701

RENAULT ESPACE Mk III (JE0_) 1.9 dTi (JE0M) Monospace F9Q 722

RENAULT LAGUNA I (B56_, 556_) 1.6 16V (B568, B561) 3/5 portes K4M 720 | K4M 724

RENAULT MEGANE I Break (KA0/1_) 1.9 D (KA0J, KA0R) Break F8Q 790 | F8Q 622

RENAULT MEGANE I Break (KA0/1_) 1.9 dTi (KA0N) Break F9Q 731 | F9Q 736

RENAULT MEGANE Scenic (JA0/1_) 1.6 16V (JA0B, JA04, JA11, JA00) Monospace K4M 700 | K4M 701 | K4M 708 | K4M 704 | K4M 712 | K4M 706 | K4M 709 | K4M 707

RENAULT MEGANE I Break (KA0/1_) 1.4 16V (KA0D, KA1H, KA0W, KA10) Break K4J 750 | K4J 714

RENAULT MEGANE I Break (KA0/1_) 1.6 16V (KA0B, KA04, KA11) Break K4M 700 | K4M 701 | K4M 708 | K4M 704 | K4M 712 | K4M 709

RENAULT MEGANE I Coupé (DA0/1_) 1.6 16V (DA0B, DA04, DA11) Coupé K4M 700 | K4M 701 | K4M 708 | K4M 709

RENAULT MEGANE I (BA0/1_) 1.6 16V (BA04, BA0B, BA11, BA1J, BA16, BA19, BA1K, BA1V,... 3/5 portes K4M 700 | K4M 701 | K4M 708 | K4M 704 | K4M 706 | K4M 709

RENAULT MEGANE I (BA0/1_) 1.6 16V (BA04, BA0B, BA11, BA1J, BA16, BA19, BA1K, BA1V,... 3/5 portes K4M 700 | K4M 701 | K4M 708 | K4M 704 | K4M 706 | K4M 709

RENAULT MEGANE I Coupé (DA0/1_) 1.4 16V (DA0D, DA1H, DA0W, DA10) Coupé K4J 750 | K4J 700 | K4J 714

RENAULT MEGANE I (BA0/1_) 1.4 16V (BA0D, BA1H, BA0W, BA10) 3/5 portes K4J 750 | K4J 714

RENAULT MEGANE I Classic (LA0/1_) 1.4 16V (LA0D, LA1H, lA0W, LA10) A trois volumes K4J 750 | K4J 714

RENAULT MEGANE I Classic (LA0/1_) 1.6 16V (LA00, LA04, LA0B, LA11, LA16, LA19, LA1J, LA1K,... A trois volumes K4M 700 | K4M 701 | K4M 708 | K4M 706 | K4M 709

RENAULT MEGANE I Cabriolet (EA0/1_) 1.6 16V (EA04, EA0B, EA11, EA1J) Décapotable K4M 700 | K4M 701 | K4M 708 | K4M 709

RENAULT MEGANE I Cabriolet (EA0/1_) 1.6 16V (EA04, EA0B, EA11, EA1J) Décapotable K4M 700 | K4M 701 | K4M 708 | K4M 709

RENAULT SCÉNIC I Monospace (JA0/1_, FA0_) 1.4 16V (JA0D, JA1H, Ja0W, JA10) Monospace K4J 750 | K4J 714

RENAULT SCÉNIC I Monospace (JA0/1_, FA0_) 1.4 16V (JA0D, JA1H, Ja0W, JA10) Monospace K4J 750 | K4J 714

RENAULT MEGANE I Cabriolet (EA0/1_) 1.4 16V (EA0D, EA1H, EA0W, EA10) Décapotable K4J 750 | K4J 714

RENAULT LAGUNA I (B56_, 556_) 2.0 16V (556A/B) 3/5 portes F4R 780

RENAULT LAGUNA I (B56_, 556_) 2.0 16V (556A/B) 3/5 portes F4R 780

RENAULT SCÉNIC I Monospace (JA0/1_, FA0_) 2.0 16V (JA1D, JA17) Monospace F4R 744 | F4R 740 | F4R 741 | F4R 746 | F4R 747

RENAULT SCÉNIC I Monospace (JA0/1_, FA0_) 2.0 16V (JA1D, JA17) Monospace F4R 744 | F4R 740 | F4R 741 | F4R 746 | F4R 747

RENAULT SCÉNIC I Monospace (JA0/1_, FA0_) 2.0 16V (JA1D, JA17) Monospace F4R 744 | F4R 740 | F4R 741 | F4R 746 | F4R 747

RENAULT MEGANE I Coupé (DA0/1_) 2.0 16V IDE (DA03, DA0P, DA14) Coupé F5R 740

RENAULT MEGANE I Cabriolet (EA0/1_) 2.0 16V IDE (EA03, EA0P, EA14) Décapotable F5R 740

RENAULT KANGOO (KC0/1_) 1.9 dTi (KC0U) Monospace F9Q 780 | F9Q 790 | F9Q 782

RENAULT CLIO Mk II (BB_, CB_) 1.9 dTi (B/CB0U) 3/5 portes F9Q 780 | F9Q 782

RENAULT LUTECIA II (BB_, CB_) 1.9 dTi (B/CB0U) 3/5 portes F9Q 780 | F9Q 782

RENAULT CLIO MIO II (BB_, CB_) 1.9 dTi (B/CB0U) 3/5 portes F9Q 780 | F9Q 782

RENAULT CLIO II (BB_, CB_) 1.9 dTi (B/CB0U) 3/5 portes F9Q 780 | F9Q 782

RENAULT CLIO Mk II (BB_, CB_) 1.9 dTi (B/CB0U) 3/5 portes F9Q 780 | F9Q 782

RENAULT LUTECIA II (BB_, CB_) 1.9 dTi (B/CB0U) 3/5 portes F9Q 780 | F9Q 782

RENAULT CLIO MIO II (BB_, CB_) 1.9 dTi (B/CB0U) 3/5 portes F9Q 780 | F9Q 782

RENAULT CLIO II (BB_, CB_) 1.9 dTi (B/CB0U) 3/5 portes F9Q 780 | F9Q 782

RENAULT KANGOO Rapid (FC0/1_) 1.9 dTi (FC0U) Camionnette/Monospace F9Q 780 | F9Q 790 | F9Q 782

RENAULT SCÉNIC I Monospace (JA0/1_, FA0_) 2.0 16V RX4 Monospace F4R 744 | F4R 746

RENAULT SCÉNIC I Monospace (JA0/1_, FA0_) 1.9 dCi RX4 Monospace F9Q 740

RENAULT SCÉNIC I Monospace (JA0/1_, FA0_) 1.9 dTi (JA0N) Monospace F9Q 734 | F9Q 731 | F9Q 736

RENAULT SCÉNIC I Monospace (JA0/1_, FA0_) 1.9 dTi (JA0N) Monospace F9Q 734 | F9Q 731 | F9Q 736

RENAULT SCÉNIC I Monospace (JA0/1_, FA0_) 1.9 dTi (JA0N) Monospace F9Q 734 | F9Q 731 | F9Q 736

RENAULT SCÉNIC I Monospace (JA0/1_, FA0_) 2.0 16V (JA1B, JA1D, JA0C) Monospace F4R 744 | F4R 740 | F4R 741 | F4R 746 | F4R 747

RENAULT LAGUNA II (BG0/1_) 1.6 16V (BG0A, BG0L) 3/5 portes K4M 710 | K4M 714

RENAULT LAGUNA II (BG0/1_) 1.8 16V (BG0B, BG0C, BG0J, BG0M, BG0V) 3/5 portes F4P 770 | F4P 772

RENAULT LAGUNA II (BG0/1_) 1.9 dCi (BG08, BG0G) 3/5 portes F9Q 750 | F9Q 650 | F9Q 670 | F9Q 674

RENAULT LAGUNA II (BG0/1_) 1.9 dCi (BG08, BG0G) 3/5 portes F9Q 750 | F9Q 650 | F9Q 670 | F9Q 674

RENAULT LAGUNA II Sport Tourer (KG0/1_) 1.6 16V (KG0A, KG0L) Break K4M 710 | K4M 714

RENAULT LAGUNA II Grandtour (KG0/1_) 1.6 16V (KG0A, KG0L) Break K4M 710 | K4M 714

RENAULT LAGUNA II Sport Tourer (KG0/1_) 1.9 dCi (KG0G) Break F9Q 750 | F9Q 670 | F9Q 674

RENAULT LAGUNA II Grandtour (KG0/1_) 1.9 dCi (KG0G) Break F9Q 750 | F9Q 670 | F9Q 674

RENAULT LAGUNA II Sport Tourer (KG0/1_) 1.9 dCi (KG0G) Break F9Q 750 | F9Q 670 | F9Q 674

RENAULT LAGUNA II Grandtour (KG0/1_) 1.9 dCi (KG0G) Break F9Q 750 | F9Q 670 | F9Q 674

RENAULT MASTER II Autobus/Autocar (JD) 2.2 dCI 90 Autobus/Autocar G9T 720 | G9T 722 | G9T 750

RENAULT MASTER II Van (FD) 2.2 dCI 90 Camionnette G9T 720 | G9T 722 | G9T 750

RENAULT MASTER II Camion plate-forme/Châssis (ED/HD/UD) 2.2 dCI 90 Camion plate-forme/Châssis G9T 720 | G9T 722 | G9T 750

OPEL MOVANO A Autobus/Autocar (X70) 1.9 DTI (JD) Autobus/Autocar F9Q 770

OPEL MOVANO A Autobus/Autocar (X70) 1.9 DTI (JD) Autobus/Autocar F9Q 770

OPEL MOVANO A Fourgon (X70) 1.9 DTI (FD) Camionnette F9Q 770

OPEL MOVANO A Fourgon (X70) 1.9 DTI (FD) Camionnette F9Q 770

RENAULT MASTER II Autobus/Autocar (JD) 1.9 dTI Autobus/Autocar F9Q 770

RENAULT MASTER II Van (FD) 1.9 dTI Camionnette F9Q 770

RENAULT TRAFIC II Autobus/Autocar (JL) 1.9 dCI 80 (JL0B) Autobus/Autocar F9Q 762

RENAULT TRAFIC II Autobus/Autocar (JL) 1.9 dCI 100 (JL0C) Autobus/Autocar F9Q 760

RENAULT TRAFIC Camionnette (FL) 1.9 dCi 80 (FL0B) Camionnette F9Q 760 | F9Q 762

RENAULT TRAFIC II Van (FL) 1.9 dCi 80 (FL0B) Camionnette F9Q 760 | F9Q 762

RENAULT TRAFIC Camionnette (FL) 1.9 dCi 80 (FL0B) Camionnette F9Q 760 | F9Q 762

RENAULT TRAFIC II Van (FL) 1.9 dCi 80 (FL0B) Camionnette F9Q 760 | F9Q 762

RENAULT TRAFIC Camionnette (FL) 1.9 dCi 100 (FL0C) Camionnette F9Q 760

RENAULT TRAFIC II Van (FL) 1.9 dCi 100 (FL0C) Camionnette F9Q 760

RENAULT TRAFIC Camionnette (FL) 1.9 dCi 100 (FL0C) Camionnette F9Q 760

RENAULT TRAFIC II Van (FL) 1.9 dCi 100 (FL0C) Camionnette F9Q 760

RENAULT TRAFIC Camionnette (FL) 1.9 dCi 100 (FL0C) Camionnette F9Q 760

RENAULT TRAFIC II Van (FL) 1.9 dCi 100 (FL0C) Camionnette F9Q 760

OPEL VIVARO A Autobus/Autocar (X83) 1.9 DI (F7, J7, A07) Autobus/Autocar F9Q 762

OPEL VIVARO A Autobus/Autocar (X83) 1.9 DTI (F7, J7, A07) Autobus/Autocar F9Q 760

OPEL VIVARO A Fourgon (X83) 1.9 DI (F7) Camionnette F9Q 762

OPEL VIVARO A Fourgon (X83) 1.9 DTI (F7) Camionnette F9Q 760

RENAULT MEGANE I (BA0/1_) 1.9 dCi (BA05, BA1F) 3/5 portes F9Q 732 | F9Q 733

RENAULT SCÉNIC I Monospace (JA0/1_, FA0_) 1.9 dCi (JA05, JA1F) Monospace F9Q 732 | F9Q 733

RENAULT MEGANE I Classic (LA0/1_) 1.9 dCi (LA05, LA1F) A trois volumes F9Q 732 | F9Q 733 | F9Q 738

RENAULT MEGANE I Break (KA0/1_) 1.9 dCi (KA05, KA1F) Break F9Q 732 | F9Q 733 | F9Q 738

RENAULT MEGANE I Coupé (DA0/1_) 1.9 dCi (DA05, DA1F) Coupé F9Q 732 | F9Q 733

RENAULT MEGANE I (BA0/1_) 1.9 dTi (BA1U) 3/5 portes F9Q 744

RENAULT MEGANE I Classic (LA0/1_) 1.9 dTi (LA1U) A trois volumes F9Q 744

RENAULT MEGANE I Break (KA0/1_) 1.9 dTi (KA1U) Break F9Q 744

RENAULT SCÉNIC I Monospace (JA0/1_, FA0_) 1.9 dTi (JA1U) Monospace F9Q 744

RENAULT SCÉNIC I Monospace (JA0/1_, FA0_) 1.9 dTi (JA1U) Monospace F9Q 744

RENAULT LAGUNA II (BG0/1_) 1.9 dCI (BG0E) 3/5 portes F9Q 752

RENAULT LAGUNA II Sport Tourer (KG0/1_) 1.9 dCI (KG0E) Break F9Q 752

RENAULT LAGUNA II Grandtour (KG0/1_) 1.9 dCI (KG0E) Break F9Q 752

RENAULT SCÉNIC I Monospace (JA0/1_, FA0_) 1.8 16V (JA12, JA1R, JA1M, JA1A) Monospace F4P 720 | F4P 722

RENAULT MEGANE I (BA0/1_) 1.8 16V (BA06, BA12, BA1A, BA1M, BA1R) 3/5 portes F4P 720 | F4P 722

RENAULT MEGANE I Classic (LA0/1_) 1.8 16V (LA06, LA12, LA1A, LA1M, LA1R) A trois volumes F4P 720 | F4P 722

RENAULT MEGANE I Break (KA0/1_) 1.8 16V (KA0S, KA12, KA1A, KA1M, KA1R) Break F4P 720 | F4P 722

OPEL MOVANO A Autobus/Autocar (X70) 1.9 DTI (JD) Autobus/Autocar F9Q 774 | F9Q 772

OPEL MOVANO A Fourgon (X70) 1.9 DTI (FD) Camionnette F9Q 774 | F9Q 772

RENAULT MASTER II Autobus/Autocar (JD) 1.9 dCi 80 Autobus/Autocar F9Q 772 | F9Q 774

RENAULT MASTER II Van (FD) 1.9 dCi 80 Camionnette F9Q 772 | F9Q 774

RENAULT KANGOO (KC0/1_) 1.9 dCi 4x4 (KC0V) Monospace F9Q 790 | F9Q 782

VAUXHALL MOVANO Mk I (A) Combi (X70) 1.9 DTI (JD) Autobus/Autocar F9Q 774

VAUXHALL MOVANO Mk I (A) Van (X70) 1.9 DTI (FD) Camionnette F9Q 774

RENAULT MEGANE I Coupé (DA0/1_) 2.0 16V Coupé F4R 746

RENAULT MEGANE I Cabriolet (EA0/1_) 2.0 16V Décapotable F4R 770 | F4R 746

RENAULT LAGUNA II (BG0/1_) 1.9 dCi (BG0R, BG0E) 3/5 portes F9Q 754

RENAULT LAGUNA II Sport Tourer (KG0/1_) 1.9 dCi (KG0E, KG0R) Break F9Q 752

RENAULT LAGUNA II Grandtour (KG0/1_) 1.9 dCi (KG0E, KG0R) Break F9Q 752

RENAULT ESPACE Mk III (JE0_) 2.0 Monospace F4R 700 | F4R 701

NISSAN INTERSTAR Autobus/Autocar (X70) dCi 80 Autobus/Autocar F9Q 772 | F9Q 774

NISSAN INTERSTAR Camionnette (X70) dCi 80 Camionnette F9Q 772 | F9Q 774

NISSAN PRIMASTAR Van (X83) dCi 80 Autobus/Autocar F9Q 762

NISSAN PRIMASTAR Van (X83) dCi 100 Autobus/Autocar F9Q 760

NISSAN PRIMASTAR Camionnette (X83) 1.9 dCi 80 Camionnette F9Q 762

NISSAN PRIMASTAR Camionnette (X83) 1.9 dCi 100 Camionnette F9Q 760

RENAULT KANGOO (KC0/1_) 1.9 dCi 4x4 Monospace F9Q 790

RENAULT KANGOO Rapid (FC0/1_) 1.9 dCi (FC0V) Camionnette/Monospace F9Q 790 | F9Q 782

RENAULT LAGUNA II (BG0/1_) 1.6 16V (BG1G, BG1H) 3/5 portes K4M 716

RENAULT LAGUNA II Sport Tourer (KG0/1_) 1.6 16V Break K4M 716

RENAULT LAGUNA II Grandtour (KG0/1_) 1.6 16V Break K4M 716

RENAULT LAGUNA II (BG0/1_) 2.0 dCi (BG1T) 3/5 portes M9R 740

RENAULT LAGUNA II Sport Tourer (KG0/1_) 2.0 dCi (KG1T) Break M9R 740

RENAULT LAGUNA II Grandtour (KG0/1_) 2.0 dCi (KG1T) Break M9R 740

NISSAN INTERSTAR Autobus/Autocar (X70) dCi 100 Autobus/Autocar G9U 720 | G9U 750

RENAULT SCÉNIC I Monospace (JA0/1_, FA0_) 1.6 BiFuel (JA04) Monospace K4M 704 | K4M 712

RENAULT SCÉNIC I Monospace (JA0/1_, FA0_) 1.6 (JA00, JA16, JA15, JA19, JA1V, JA2B, JA2C, JA0B,... Monospace K4M 700 | K4M 706 | K4M 707 | K4M 776

RENAULT SCÉNIC I Monospace (JA0/1_, FA0_) 1.6 (JA00, JA16, JA15, JA19, JA1V, JA2B, JA2C, JA0B,... Monospace K4M 700 | K4M 706 | K4M 707 | K4M 776

Montage d'origine : VALEO

Numéro de l'alternateur/générateur : 2542270; am KFZ ermitteln!

Tension du réseau [V] : 14,4

Tension nominale [V] : 12

Type d'alternateur/de générateur : Régulateur d'alternateur, Régulation positive