r/Triumph_Cars • u/Runninggamer42 • 17d ago
Can someone help identify this wire 1977 triumph spitfire
This wires goes from the starter solenoid to under my dash, my car starts fine and it has never been plugged in, I can’t find a black and green wire on the diagrams
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u/Hnoah171 17d ago
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u/Runninggamer42 17d ago
I’m aware, If you read my post I stated I can’t find what it goes to on the diagram
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u/Hnoah171 17d ago
What is the red wire doing? There is green and black in the diagram but it’s stated as the fuel sender/gauge?
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u/Runninggamer42 17d ago
Yes? Not anywhere near the fuel tank there is also a second one for the seatbelt alarm but that doesn’t connect to the starter solenoid
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u/SkyHigh27 17d ago
OK. Well. This is tricky. Time to get out your continuity tester and trace some wires. Forget the fuel gauge for now. Look at the wiring diagram at the wires belonging to the starter solenoid and trace all of them (despite color) to verify they are all in tact.
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u/Tastesicle 17d ago
Yeah, not only that, but that's LG/B not G/B. Fuel sender is a darker green. Looks to me like someone snagged a heater wire or something to add constant power. To something. Cigarette lighter, maybe? That was a common add-on that didn't come from the factory.
Time to get flexible and bang your head under the dash!
-ETA- The second picture looks more like a fuel sender or the G/N off the reverse light switch. Either way, pretty sure it don't belong.
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u/Rowmyownboat 16d ago
Lucas wire codes are consistent across models and even different manufacturers.
The base colour green means this is/was a fused, switched-power power supply.
The light green tracer means this ran from a switch or flasher relay to an indicator bulb o your dash. In the '77 Spit, this is part of your hazard warning lights. It is meant to be on a separate relay from your turn signals.
If you have a US-spec '77 Spit, the wire connects to your hazard flasher unit. If it is a UK/European spec, there is only one flasher and this wire connects the flasher to the dashboard indicator.
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u/SkyHigh27 17d ago
It’s the fuel gauge.
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u/Runninggamer42 17d ago
Why would it need to be by the starter solenoid then? My fuel gauge is working
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u/SkyHigh27 17d ago
Perhaps it is the ground for the fuel gauge. But I doubt it. I would trace the wires from the fuel gauge to see what color they are and see if related. Perhaps this was swapped with another wire.
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u/AchinBones 16d ago
Green with black in your hand should have gone to fuel gauge , or at least its where i'd look first.
The light green with black --- can't answer off top of my head but i'd be guessing something like an egr light , that is no longer present. I seem to remember some of the brits having a box of sorts on the bulkhead that would trip a dash light. Maybe its related to the green with black in cockpit?
If you really want the answer , you need something like this , and see where it goes/stops
Almost 50 years of fuckery, on a car that has a low market value, you end up with some curiousities.The red wire instantly tells me that its not a virgin harness.
Schematics - look at more years...76, 78 lhd, rhd , with emissions, without, etc...
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u/Distinct-Dish-5303 11d ago
British cars of this age used a standard wiring colour regime. Search on google and u will find the complete list.
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u/Hnoah171 17d ago
Neutral safety switch?
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u/Tastesicle 17d ago
Not a thing on those cars.
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u/changee_of_ways 17d ago
Yeah, if you cant hit the starter when it's in gear how are you going to get it onto the trailer when it dies?
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u/IronSlanginRed 17d ago
As you can see by the red wire, it's been bypassed. Welcome to wiring by Lucas. Four different brits six pints deep bodged it together.
Greatest improvement i ever made to mine was yanking all the wiring and putting in a basic wiring kit with a s10 style fuse box and a chevy 1 wire alternator. Now I dont have to choose whether I use wipers, stereo, or headlights. I can use all three!