R B Slate RH TS WATER TEMPERATURE HEATER FAN GW N/LG NY U 4 N SOLENOID B GP W PW GAUGE = one pin of a multi pin connector. TRANSMISSION R SWITCH G PB N N BUTTON B RW Left GP W W White P G R YU GR P Left WB 8 RG TRANSMISSION GK B B STARTER YN 8 Y LAMP & SWITCH *TS SWITCH WB HEATER CONTROL RW Orange P SPARK UW GR mods I do on my own MGB. hope you find them useful. + GW (UW) K Brown GP The wiring harness burned (GW) LG/N LH TS U 4 GW YP BATTERIES G BRAKE FAILURE 2 Green BRAKE FAILURE UW Black & SWITCH - GT ONLY GW W BUZZER RG G GP 4 R G LOW BEAMS Right 7 W PW PW UW Wiring Diagrams for MGB, MGC Click links for 33 different wiring diagrams for MGB and MGC, large format in color. UR HEATER FAN R/LG N P P G (GW) G G 4 5 B G PW G G 2 3 R/LG CONTROL Y DIMMER & R R ON - OFF SWITCH Left S P R INDUCTION P B N BUTTON SOLENOID P G INDUCTION 3 PG HAZARD SWITCH GN CIGAR G GN W Ind P CONTROL B - SOLENOID B LG/B (R/LG) R G N (LG/N) R TRUNK LAMP Right * CONTROL 1 YR BUTTON G 3 GAUGE LIGHTS B W LG B YN GY G (GW) FLASH-TO-PASS (GR) GR R (W) K RW WG G + YN green GN RN G GK R R RG Y (LG/N) W Rubber Bumper #MGB - check you have the correct coil? Green VALVE & SWITCH GB NY L RELAY component they are connected to. P RW 3 18 Images about No Power to Half of Fuse Box : The DC Wiring Page - Connectors, Fuses and Wire, Cat 257b Fuse Box Diagram and also The DC Wiring Page . SWITCH W2 W1 RH REAR W2 W1 G 3 FROM BENTLEY OIL PRESSURE 2 LAMP N LOW BEAMS R SWITCH OVERDRIVE R GAUGE VOLTAGE + TURN SIGNAL B (P) W Right GR HEADLIGHT 3 2 STARTER UR COIL RW COIL RW FLASHER UW B IGNITION G N B LOW BEAMS RH FRONT (N/LG) TRANSMISSION ON - OFF SWITCH PB FUEL GAUGE & SENDER RG 3 W BUTTON & SWITCH - GT ONLY PG R LH REAR B B TEMP GAUGE & SENDER + HEATER CONTROL R N W1 W2 OVERDRIVE B (R/LG) LH FRONT 3 B sheet 11 N PW UR COLOR CODES HEATER FAN . Source: www . B G LH REAR UR SOLENOID UW G Green 2 FUSE BOX N Blue HEADLIGHT WG FUEL LEVEL N Read more: In the MGB 70/71 wiring diagrams the purple is used as a feed wire from the fusebox . RW R FLASHER GP YN + W LG/G G Green R OIL PRESSURE LOW BEAMS UR G R R LG/G B Sign up for e-news. B *These two switches are combined in one housing N 1 U U B RADIO 7 PW ON - OFF SWITCH GN R U CIGAR LIGHTER INDICATOR B Black CONNECTION (LG/N) GW YN (UR) ALTERNATOR WARNING W (UW) B GK STARTER U GN UW B MARKER LIGHTS RN 6 R BUTTON B DIAGRAM 18 - 75/76 MGB E GK B R G LG/N G PB G (P) GW R PK B GAUGE VOLTAGE GAUGE LAMP LIGHTER B DISTRIBUTOR R G R P 1 WG W 4 B (U/LG) N N A dmp PUBLICATION 2005 G 2 G N 4 W N RW (N) REVERSE SWITCH P B P HIGH BEAM INDICATOR LH FRONT UW YP DIMMER PK N WR IGNITION GK LH FRONT Brown RH REAR G G 3 DEFROSTER SWITCH GP SWITCH B B 3 - STABILIZER R LG/Y & TEST SWITCH 4 HAZARD Y LG/P 2 1 (GW) N RH REAR DIMMER 10 W B 7 LG/G Pink GAUGE & DASH G R *TS SWITCH G GY FLASHER GN L W2 C1 GR - R UR WR SWITCH LH REAR LH REAR G U GW G O G Wire colors shown in ( ) are supplied as part of the LAMP & SWITCH UW DISTRIBUTOR UW CLOCK SEATBELT N 3 (G/K) TAIL LIGHTS & (WR) G + B+ B LOW BEAMS N B RW (GR) component they are connected to. GR GW R R FUEL PUMP WLG LG/N G LIGHTER G HEATER FAN MOTOR G GN 2 BUTTON COUNTER & LAMP P SOLENOID LH REAR R PW RADIO GW OIL PRESSURE/WATER TEMPERATURE B GB Yellow W Red 4 INERTIA N B Yellow R SWITCH TACHOMETER Ind RW YR 8 G B W1 C2 CIGAR LIGHTER WB Pink P 2 RN LG Light Green SWITCH PW SWITCH Black R WR INDICATOR RADIO 8 G G RW 5 GW N R SPEEDOMETER P G GAUGE & DASH GR N COLOR CODES P G sheet 6 PW B GO GK RW GN N D B CIGAR LIGHTER PG Left OVERDRIVE green TEMPERATURE W N/LG G GR GW IGNITION INTERLOCK SWITCH G GW (N) (PK) COLOR CODES * PW PW (U) RW G INDICATOR FROM LATE BENTLEY GN RH FRONT W N LG/G P * DIMMER & Orange harness from those measurements. RG G U FLASHER Orange GN G 1 GW green LH TS GR TACHOMETER NW RW N 7 W GO BRAKE FAILURE 4 G http://www.advanceautowire.com/mgb.pdf COLOR CODES R Pink COURTESY/MAP MODULE 2 WR 3 P R WB W Ind LG/G 2 (G) 3 R R PB YP 4 UW & DOOR SWITCHES A useful resource showing wiring diagrams across all the years of mgb manufacture. UR GR HEADLIGHT LG/G LG/G B U/LG B COLOR CODES RADIO R B W B RW RW B SWITCH BATTERIES P RW UW COIL B TAIL LIGHTS & FLASHER W TRUNK/HATCH LAMP STARTER K LG/G N G BRAKE SWITCH RW R GB FUEL PUMP PW Yellow N SWITCH B (UR) O G (R/LG) PB N R B MODULE B GN P PB OVERDRIVE WN HAZARD LAMP & SWITCH GN 1 NW WN B WB (WG) WB PK Right G U/LG GK B R Pink GW CIGAR RG SWITCH WIPER/WASHER Yellow The MGB is not listed below, so I used Triumph. DISTRIBUTOR 3 NB WASHER MOTOR B 100 amp fuse box schematic diagram. B INDICATOR LAMP N/LG DIMMER & TAIL, REAR MARKER, & SWITCH B Green B SPEEDOMETER GR PW OVERDRIVE B please click here and follow the instructions. OIL PRESSURE/WATER TEMPERATURE P BW DIMMER RW GB SWITCH Pink CLOCK RW G N B HAZARD FLASH-TO-PASS WB ON - OFF SWITCH ALTERNATOR RW HIGH BEAMS Batt + + WR SWITCH S GR R 2 RW - B S UW 1 HIGH BEAM INDICATOR 2 WR (G/K) *HORN YR LG/G GP G G FROM BENTLEY E3212AW Orange * FLASH-TO-PASS Ind Ind N (GW) GN OVERDRIVE B MARKER LIGHTS ON - OFF SWITCH G Blue Left P PB NW A good example is often purple to horns (usually from the fuse box) where the horn button (switch) earths the circuit. 1.8 (1798 cc, bmc b series). UR B 2 DIMMER & G RW G (W) 3 3 Orange G NG S (UR) R GR Instead of the wire harness coming into the engine. P GK N G R 1 (N) GK RH TS UW GP NY GAUGE DIMMER & OIL PRESSURE B PB ALTERNATOR WARNING STARTER RW NY N R GY HIGH BEAMS C1 Orange RW LG/P 3 HEATER CONTROL RW L K GP The first thing I would suggest, beside blowing up the wiring diagram, is getting a label device with which you type the color and wire name and print it out and loop it over the wire (s). LAMP & SWITCH OVERDRIVE GN - (UW) SWITCH B + (U) LAMP = one pin of a multi pin connector. COURTESY LAMP TRUNK/HATCH RW (UR) P Pink green B RW (N/LG) 4 (R/LG) - WR GB G LIGHTS RG GAUGE & DASH W 7 O GK B Purple 5 CIGAR LIGHTER SWITCH VALVE & SWITCH Left Slate N RW N Y (U) CONTROL SWITCH FLASHER N N G FROM BENTLEY E2766W LG/G SPEEDOMETER BW (R/LG) Green N GN B GW B LOW BEAMS *TS SWITCH R SEATBELT BUCKLE New fuses and relays for the MGB steve livesley 19/11/2020 Electrical, Modifications, Reblog Previous Next Since winter has come I've decided to upgrade the fuse box in my MGB GT. GR B PW HEATER FAN (N/LG) S CIGAR GW Y ALTERNATOR WARNING COLOR CODES P G UW W 7 W Left STARTER GY B - (P) SWITCH PB BUZZER G I keep a copy in my car just in case I have a problem with the electrics whilst on the road. INTERLOCK SWITCH LH FRONT R C2 P B PW W N W G W P G RH REAR LH DOOR IGNITION GAUGE P BG (R/LG) WN P N LH FRONT green WG P & DOOR SWITCHES Left + R & SWITCH B U/LG NP U G P G LG/G 3 HEATER FAN MOTOR 3 CONTROL STARTER DISTRIBUTOR HEADLIGHT HAZARD K MODULE RW Right SWITCH 3 B WB N GY BW WR YP RN 1 B RG W GW B 1 P FLASHER UW N UR Wire colors shown in ( ) are supplied as part of the RW U RW B P NY UW R FLASH-TO-PASS G FLASHER B How to remove the MGB side moulding. B B G OVERDRIVE B FUEL PUMP RADIO G Y N P B R GP Purple R Pink FRONT PARKING & Y G G PG - P FLASHER UR B (N) (PK) B GN G 8 G S GR GW B G 5 Right L (S) 1975 mustang 302-no wires on my coil so which ones do i need?. LICENSE PLATE LAMPS U B B RW N G (UW) HEATER FAN YB HAZARD 1 SWITCH GT LG/N G N Good luck and hopefully this will keep you rolling down the road and the lights burning. green GP 3 N B RH FRONT P GR Green S R B Y 2 DIMMER GN R TACHOMETER DISTRIBUTOR RN GAUGE & DASH B SWITCH FUEL LEVEL B FRONT & REAR PK FLASHER Yellow Brown B GU ALTERNATOR WARNING YR Left PB B STARTER B STABILIZER RH REAR GR B G R INTERLOCK SWITCH Left B FLASHER G U G GW RW PW B (N/LG) green YP R G WIRE (GW) CONTROL G LH FRONT 1 RW SEATBELT SWITCH B GN RH REAR LG/N & RELAY R P TEMP GAUGE & SENDER GN RW PW (P) TACHOMETER N WR Wire colors shown in ( ) are supplied as part of the A dmp PUBLICATION 2005 R DIMMER N WR Turn the ignition on, and the fans should start. P Wire colors shown in ( ) are supplied as part of the GW LG/B LG/G Black GR W R B Batt + + B P GAUGE & DASH RG FUEL GAUGE & SENDER PK FUEL GAUGE & SENDER 10 SWITCH N B R/LG 1 GO WIPER Wire colors shown in ( ) are supplied as part of the RH REAR TACHOMETER mods I do on my own MGB. hope you find them useful. (LG/B) WN B (R/LG) GP HEATER FAN MOTOR GY Slate REAR WINDOW DEFROSTER, WB LH TS GR GW COURTESY/MAP RH TS STARTER Also behind the dash panel is another Line Fuse for Hazard Flasher Unit Additional wiring needs to be provided from terminal 7 via inline fuses for the relays (if fitted) for G Green GR BRAKE LG Light Green *HORN W D SWITCHES component they are connected to. R TACHOMETER 5 + + COUNTER & LAMP R Blue GN R RW *TS SWITCH B OVERDRIVE UW GR GW R RG RN W LIGHTS 1 B G RW COURTESY LAMP ALTERNATOR WARNING B FLASH-TO-PASS ON - OFF SWITCH B LAMP (GK) GO GW (UW) R OVERDRIVE SWITCH W . GN SWITCH N 1 Pink W1 C2 HIGH BEAMS GN N NB + + R B G UW N WB DIMMER & UW Orange W LG/N HAZARD 2 G PG F (N/LG) YP R G 4 RW WB RH FRONT RG RW WIPER MOTOR RH FRONT F Ind RH TS GW P N/LG RW 1 information about the MGB and MGB GT classic cars including news and reviews also updates on repairs, servicing and diy modifications I do on my own MGB Roadster. N B WG *TS SWITCH B RH FRONT LG/P 3 P HEATER CONTROL RW N HEATER FAN MOTOR U/LG HAND BRAKE R GR WG Left INDICATOR 4 TRUNK/HATCH 3 WN N W sheet 13 R G B R LAMP (LG/N) N GK Yellow B HIGH BEAMS REVERSE LIGHTS W G GK green BW B & DOOR SWITCHES & TEST SWITCH R P RELAY TAIL LIGHTS & PB STABILIZER G R N LG/N B LH TS UR 8 LG/N G Slate WIPER MOTOR W P G GR ALTERNATOR component they are connected to. P PB R YW B Y N W P 4 N N W G WB TURN SIGNAL Our magazine is funded through the generous support of readers like you. BATTERIES B W WB PW RW B GR GW (LG/B) Disassembling and Inspecting the MGBEngine. GK HEATER FAN MOTOR W White W (LG/N) B GAUGE VOLTAGE O (GR) N Orange DIMMER & N P INTERLOCK SWITCH W/LG W W B GB HAZARD SWITCH GW sheet 14 4 1 HEATER RN G LAMP RG SWITCH GN UR INDICATOR SP LG/N LG/W 2 BRAKE FAILURE RW B P RW * GW R N 8 A dmp PUBLICATION 2005 TURN SIGNAL LG/N G B GK B DISTRIBUTOR UW BW RELAY N W G sheet 7 1 B G Here are a few checks on how you can pinpoint the causes. SWITCH U G 2 RW N R FUEL PUMP L RH TS P (N) (PK) B N WLG FRONT PARKING & Y Pink B WB (S) A dmp PUBLICATION 2005 7 UW N N/LG When ever I find useful and interesting information about the MG MGB & GT (or any other classic BW LAMP WB 3 N - Y R TAIL LIGHTS & 1 G U R SWITCH IGNITION PW WG R HIGH BEAMS INDICATOR PB + + HEATER CONTROL RW Click & Collect. B 2 PG HEADLIGHT Yellow HORN IGNITION TACHOMETER & SWITCH WIPER MOTOR BRAKE N HEATER CONTROL WIPER + (WG) B YP SOLENOID HEATER FAN SEATBELT SWITCH (S) GU YN - B G N PW U GR *TS SWITCH 1 ALTERNATOR G I DIAGRAM 6 - 70/71 MGB UR RW LICENSE PLATE LAMPS VALVE & SWITCH WASHER MOTOR 1 P NP HEATER CONTROL Blue HEADLIGHT L R/LG R W B 2 FUEL LEVEL B INTERLOCK SWITCH R G 3 GR RG (GK) + GU PK SWITCH WG 3 (U/LG) RW (UR) GK UW B WB G R GK NP B RG 2 fuse diagram box uplander montana pontiac chevrolet buick terraza 2005 panel instrument 2008 sv6 2006 2007 wiring diagrams fuses info [HZ_6734] 1974 Hazard Switch Pins What Wire Goes Where Mgb Gt Forum Mg HEADLIGHT SWITCH S YP B SWITCH GAUGE & DASH B FROM BENTLEY 2NB034 HIGH BEAM INDICATOR N GN WB HORNS B DISTRIBUTOR 1 SEAT SWITCHES PW WN GW UR WG UW YR N UW PB HORNS SEATBELT WARNING LAMP F+ Ind I SWITCH G INTERLOCK SWITCH G Ind SWITCH I 7 RW GW 5 Brown R Mgb Fuse Box Diagram - Wiring Diagrams cars-wiringdiagram.blogspot.com. STARTER W/LG W R HIGH BEAMS R R Red 1977 MGB W/CAT CONV 4 GN P O G B B W RH FRONT R Green B GU (UW) (GR) = one pin of a multi pin connector. 6 CONTROL GN green B P WATER TEMPERATURE 7 U B green N B LG/N Some excellent easy to read and follow wiring diagrams which are colour coded for each of the fused circuits. W B G GB But the brown wire at the ignition switch should be 'hot' regardless. F 3 N/LG ILLUMINATION LAMPS SWITCH L N/LG 3 G R (GR) B 4 SWITCH GN G FLASH-TO-PASS information about the MGB and MGB GT classic cars including news and reviews also updates on repairs, servicing and diy modifications I do on my own MGB Roadster, Since winter has come Ive decided to upgrade the fuse box in my MGB GT. NP SPARK GN 1 B (P) WIPER MOTOR R RG SWITCH GP LG/N YR GW GW SEATBELT (U/LG) YP WARNING LAMP GO N/LG GP WB G IGNITION W SWITCH FLASHER G G *TS SWITCH 2 WIPER MOTOR R P P INDICATOR REVERSE LIGHTS R (P) P CONTROL B G RW G UW REAR WINDOW DEFROSTER, SWITCH R TEMPERATURE Orange G RELAY G NP F SWITCH ON - OFF SWITCH ALTERNATOR (LG/B) GW GK SEATBELT BUCKLE HAZARD L PW RH REAR MG MGB fuse box and relays diagrams. HAZARD 3 B ALTERNATOR WARNING 5 4 R W B * R/LG G 4 (R/LG) TAIL, REAR MARKER, & 2 GK B R LH FRONT GO U B N (U) P (LG/N) G (WG) FLASH-TO-PASS LICENSE PLATE LAMPS SWITCH Y G N/LG GAUGE B CIGAR LIGHTER 8 LG/N W2 GP R LH FRONT COURTESY LAMP SWITCH Mgb Fuse Box Diagram - Wiring Diagrams cars-wiringdiagram.blogspot.com mgb fuse box diagram wiring laiser schematic 1977 Mg Midget Wiring Diagram - Wiring Diagram wiringdiagram.2bitboer.com [HZ_6734] 1974 Hazard Switch Pins What Wire Goes Where Mgb Gt Forum Mg Download Diagram elia.akeb.unec.frag.mohammedshrine.org B PW 8 UW GW U RW Purple 2 B #MGB and GT Colour Coded Wiring Diagrams. HORNS U GR SPEEDOMETER (W) Blue UW (UW) GW + 3 SWITCH OVERDRIVE BUTTON GAUGE VOLTAGE LG Light Green GP RG PB GP (LG/B) 7 NW COURTESY LAMP OIL PRESSURE RELAY HEATER I (UW) STABILIZER FUEL GAUGE & SENDER (U) U/LG P B GO Yellow P SWITCH

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