Wiring reverse light to switch
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Joined: Oct 2007
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From: Manchester NH
Car: 1985 Pontiac Trans Am
Engine: 305
Transmission: T-5
Wiring reverse light to switch
I believe I eliminated my factory reverse light plug when I prepared my harness and eliminated all the Ecm wiring years ago!I cannot find any good wiring pics or how too’s explaining which connecters have the wires I need to run to my t5 reverse switch.I have a 1985 Trans Am has carbed lg4 original.Hope some of u electrical gurus can help me Thanks
Thread Starter
Member
iTrader: (2)
Joined: Oct 2007
Posts: 239
Likes: 1
From: Manchester NH
Car: 1985 Pontiac Trans Am
Engine: 305
Transmission: T-5
Re: Wiring reverse light to switch
Thank u its a manual if I understand this I have to figure out what and where the c100 connecter is.then run the dark Blue wire to the tranny switch.were do u find these diagrams?
Joined: Aug 1999
Posts: 5,280
Likes: 473
From: RI
Car: 1984 Camaro Berlinetta
Engine: LT1
Transmission: T56 6-speed
Axle/Gears: 4.11 LS1 Rear End
Re: Wiring reverse light to switch
Pretty sure the diagram above is from an 88+ Thirdgen & not applicable to an 85 Stick.
When you removed the original ECM & it's wiring you probably removed the reverse light wiring. Remember the Dash-to-ECM wiring harness connectors under the passenger side of the dash ?? It's called C207 & your going to have to look there to find the reverse light wiring. Check PINs 'B', and 'G'.
When you removed the original ECM & it's wiring you probably removed the reverse light wiring. Remember the Dash-to-ECM wiring harness connectors under the passenger side of the dash ?? It's called C207 & your going to have to look there to find the reverse light wiring. Check PINs 'B', and 'G'.
PIN Color From / To (Notes)
A Brn ALDL (pin C) / ECM (AIR control)
B* Dk Blue BU switch / Rev Lights ( V8, T5 )
B* Red ALDL / Fuel Relay ( V6 - TPI )
B* Org/Blk FP FUSE / Fuel Relay ( L4 )
C* Brn/Wht ECM / CE Light ( L4- V6 - TPI )
C* Wht/Grn Light Driver / ECM ( LG4 & L69 )
D* Blk/Org FP/INJ fuse / Fuel Relay ( L69 )
D* Tan/Wht Fuel Relay / Fuel Pump ( V6 )
D* Lt Blue Fuel Relay / Fuel Pump ( TPI )
D* Tan Oil Pr Sensor / Oil Pr Gauge ( L4 )
E Wht/Blk ALDL / ECM (test)
F Pnk/Blk IGN fuse / EGR-ECM
G* Lt Green BU switch / Rev Lights ( V8, T5 )
G* Pnk/Blk Gage Fuse / MAF Relay ( V6)
G* Pnk/Blk Gage Fuse / Burn Off Relay ( TPI )
G* Pnk/Blk Gage Fuse / Air Cond Relay ( L4 )
H Tan/Blk ALDL / TCC-ECM
J* Ppl Starter / Fuel Relay ( L69 )
J* Org ALDL / ECM ( L4 - TPI )
K Brn ECM / VSS
L Tan/Wht Fuel Relay / Fuel Pump ( L4 - L69 )
M Blk/Wht VSS,P/N switch / Grd
N Org/Blk ECM / P/N switch
P Ppl Brake / TCC
R Ppl/Wht Crank Fuse / Cold Start-ECM ( V6-L4 )
A Brn ALDL (pin C) / ECM (AIR control)
B* Dk Blue BU switch / Rev Lights ( V8, T5 )
B* Red ALDL / Fuel Relay ( V6 - TPI )
B* Org/Blk FP FUSE / Fuel Relay ( L4 )
C* Brn/Wht ECM / CE Light ( L4- V6 - TPI )
C* Wht/Grn Light Driver / ECM ( LG4 & L69 )
D* Blk/Org FP/INJ fuse / Fuel Relay ( L69 )
D* Tan/Wht Fuel Relay / Fuel Pump ( V6 )
D* Lt Blue Fuel Relay / Fuel Pump ( TPI )
D* Tan Oil Pr Sensor / Oil Pr Gauge ( L4 )
E Wht/Blk ALDL / ECM (test)
F Pnk/Blk IGN fuse / EGR-ECM
G* Lt Green BU switch / Rev Lights ( V8, T5 )
G* Pnk/Blk Gage Fuse / MAF Relay ( V6)
G* Pnk/Blk Gage Fuse / Burn Off Relay ( TPI )
G* Pnk/Blk Gage Fuse / Air Cond Relay ( L4 )
H Tan/Blk ALDL / TCC-ECM
J* Ppl Starter / Fuel Relay ( L69 )
J* Org ALDL / ECM ( L4 - TPI )
K Brn ECM / VSS
L Tan/Wht Fuel Relay / Fuel Pump ( L4 - L69 )
M Blk/Wht VSS,P/N switch / Grd
N Org/Blk ECM / P/N switch
P Ppl Brake / TCC
R Ppl/Wht Crank Fuse / Cold Start-ECM ( V6-L4 )
Last edited by John in RI; Jan 2, 2018 at 12:16 AM.
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