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1.367m later
Join Date: Feb 2002
Location: small farm town Iowa..........at last
Posts: 6,357
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Need HELP with electrical issues
I'm having problems with the brake lights on an '89 Carrera Cab. The problem is I only have brake lights when the headlights are on. I've checked the connections on the fuse block and both switches on the master cylinder. Those look fine. With the headlights OFF, when I touch the brake pedal I can hear a relay click and lose power at the fuse. I'm baffled
 . Also can someone explain the elements in the red boxes on the attached schematic? Specifically T9 and T10 and where might I find these on the car.TIA! 
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non velox ad propitiare, verisimile non oblivisci If it's not The Original Automotive Innovations and Restoration, then it's just hot AIR. |
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02-22-2012, 05:52 PM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,081
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wild guess...head LT switch? is that in common with flow?
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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02-22-2012, 06:00 PM
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1.367m later
Join Date: Feb 2002
Location: small farm town Iowa..........at last
Posts: 6,357
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Quote:
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non velox ad propitiare, verisimile non oblivisci If it's not The Original Automotive Innovations and Restoration, then it's just hot AIR. |
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02-22-2012, 06:07 PM
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Registered
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The relay click is interesting I could be wrong but I dont think there is a relay in the brake light system. Im wondering if some one upgraded your headlights to relay control and ran the brakes through the relay as well.
It would sound as if your brake lights are powered of the same junction as your head lights. May be an issue in the fuse box, may be a hack wiring job from a PO. I would trace all your head light wires and see if there is any thing our of the ordinary there. Then trace the wires around the brake switch. I would also try and find that relay and figure out whats going on there. Regards Dave
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'78 911SC Targa (Back In Action!) '00 996 Carrera (New kid on the block) '87 944 (college DD - SOLD) '88 924s (high school DD - Gone to a better home) |
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02-22-2012, 07:46 PM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,081
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Quote:
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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02-23-2012, 03:39 AM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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you say you have brake lights when the HL's are on.?
when the HL's are on, and you press the brake pedal, the lights get brighter, or, you just have tail lights when the HL's are on? these are 2 seperate circuits is the reason i ask. check the connections related to the brakes. make sure they are clean. with a test light, check for power at the brake switch, fuse, connections and the the brake lights socket. since both do not work, look for aomething common. make sure you have the light connected to a good ground.
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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02-23-2012, 04:17 AM
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I agree with the previous post I would check the headlight relay wiring.
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1974 sahara beige 911 targa 1982 chiffon 911sc 1985 prussian blue metallic carrera |
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02-23-2012, 07:42 AM
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1974 Porsche 911 targa 2.7
