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Registered User
Join Date: Jan 2013
Location: Grapevine, TX
Posts: 214
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Wiring help
During my rebuild, I found 3 wiring issues at the 2 6 pin plugs at the tail lights. The PO had apparently cut the grey and gry/blk wires on the left side and jumpered a lead from the gry/red wire. Thought this may mean something to someone. Common issue? From schematics it looks like the gry/red stripe on right side is brake light and gry/blk on left is parking light. The gray wire is the license plate bulb? Not sure why he would splice the red/gry with gry/blk?
  Diagram on Pelican showing gry/red and gry/black are both parking lights. Maybe spliced from right side, sharing fuse? Why cut the gray wire?
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John "Build a man a fire and he's warm for the rest of the day. Set a man on fire and he's warm for the rest of his life". -internet sage Last edited by Mitch1; 05-05-2014 at 06:28 PM.. |
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05-05-2014, 06:04 PM
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ROW '78 911 Targa
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Maybe he had trailer lights spliced in?
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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05-05-2014, 07:52 PM
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Hmmm, I'm thinking car alarm. Spliced into the brake light and parking light so the alarm can flash them when it goes off. In removing a stupid car alarm from my car, there currently is still one wire from the old alarm that I found under the door sill. It snakes back through some trim to where I can only assume is the 3rd brake light. I haven't fully chased it down yet.
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1987 911 Carrera coupe - Guards Red 2010 997.2 C4S 6-Speed 2005 Mini Cooper Convertible (R52) - Wife's car 1977 VW Bay Window Camper Bus Last edited by wrxnofx; 05-05-2014 at 08:29 PM.. |
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05-05-2014, 08:25 PM
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Registered User
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Location: Grapevine, TX
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Hoping you might chime in Dennis. Looks like something is wrong with left side rear park light circuit. Can't remember if PO had wires spliced together to put both park lights on right side fuse. Checked fuse box just now. Gry/blk stripe removed from fuse 4th from front. Cover shows it to be left park light rear. Ck'd continuity. It's the left park light wire. Need to check for short to grnd. Isn't the engine compartment light on that circuit?
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John "Build a man a fire and he's warm for the rest of the day. Set a man on fire and he's warm for the rest of his life". -internet sage |
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05-05-2014, 08:30 PM
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Registered User
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Location: Grapevine, TX
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Which side is supposed to be grnd on the engine compartment light? There is a side that has no insulator and side that does. The grey wire was on the side with no insulator. Think I read another thread that said that was supposed to be grnd. Maybe engine compartment light wired backwards causing short on left side park light circuit? Rather than trace it, they just cut the left park light circuit out all together?
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John "Build a man a fire and he's warm for the rest of the day. Set a man on fire and he's warm for the rest of his life". -internet sage |
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05-05-2014, 09:05 PM
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Registered User
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Location: Grapevine, TX
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Crazy, got all kinds of left over car stereo wiring to sort through, but they couldn't trace park light circuit issue. Not PO's fault. Probably whoever worked on it for him.
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John "Build a man a fire and he's warm for the rest of the day. Set a man on fire and he's warm for the rest of his life". -internet sage |
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05-05-2014, 09:08 PM
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ROW '78 911 Targa
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Check the terminals on the engine light individually to ground (engine lid strap) with a meter.
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05-05-2014, 10:41 PM
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ROW '78 911 Targa
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John,
What year is the body on your car? No garage info for me to confirm. I know I should know, but it has been a while... 
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. Last edited by timmy2; 05-05-2014 at 10:55 PM.. |
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05-05-2014, 10:46 PM
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ROW '78 911 Targa
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Grey/red and grey/black are both running lights. Black/Yellow wires are the stop lights.
Must have had an open wire somewhere on the fuse 4 fed grey/black wire at some time and instead of tracing and replacing, it was easier to jumper it back over to the left tail light. Take a good look at the schematics for the '78. M2 and M4 appear above Base line numbers 13 and 17 for running lights, but also both appear again at Base line 50 and 51 for the brake lights. So, the PO had an open wire to the rear left light and jumped the running lights over from the right side. Probably find the grey/black wire cut somewhere and buried in the harness. I'll have to look up the engine compartment light wiring tomorrow some time to figure that part of it out.
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. Last edited by timmy2; 05-05-2014 at 11:12 PM.. |
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05-05-2014, 11:09 PM
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Registered User
Join Date: Jan 2013
Location: Grapevine, TX
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I thought that to. Checked continuity at grey/black from front to rear. OK. Could be shorted though. Checked circuits at engine light. Both show short to grnd. Switched them and grey wire just showing high resistance to grnd but not open.
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John "Build a man a fire and he's warm for the rest of the day. Set a man on fire and he's warm for the rest of his life". -internet sage |
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05-06-2014, 05:19 AM
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Registered
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Quote:
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1987 911 Carrera coupe - Guards Red 2010 997.2 C4S 6-Speed 2005 Mini Cooper Convertible (R52) - Wife's car 1977 VW Bay Window Camper Bus |
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05-06-2014, 06:19 AM
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ROW '78 911 Targa
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For the light, was the bulb in the socket? That would explain a high ground resistance. Pull the lamp and check again if in there when you tested.
What year is your car? Sent from my iPhone using Tapatalk
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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05-06-2014, 06:28 AM
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Registered User
Join Date: Jan 2013
Location: Grapevine, TX
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@Dennis, it's an 83. You built my engine harness.
Yeah, that was stupid of me, bulb was in. @wrxnofx, my insulator is on right side. Maybe someone reinstalled it backwards but wired it for original position.
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John "Build a man a fire and he's warm for the rest of the day. Set a man on fire and he's warm for the rest of his life". -internet sage |
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05-06-2014, 10:27 AM
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ROW '78 911 Targa
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I knew I built the harness last August, just couldn't remember the exact year, 81-83 are the same engine harness.
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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05-06-2014, 10:55 AM
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Registered User
Join Date: Jan 2013
Location: Grapevine, TX
Posts: 214
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Man, has it been that long? I still don't have the engine in.
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John "Build a man a fire and he's warm for the rest of the day. Set a man on fire and he's warm for the rest of his life". -internet sage |
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05-06-2014, 11:08 AM
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ROW '78 911 Targa
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Wiring help
Yeah it has been a while, I was looking through the emails we exchanged to see if any mentioned the year, but we must have discussed it on the phone or in a PM.
Get that engine in, it is time to drive! Sent from my iPhone using Tapatalk
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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05-06-2014, 12:47 PM
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Heinz
1987 Porsche 911 Carrera
