Lighting issue for dash lights

[mgro1959]

Every so often something turns up when you are doing something else and you think they are related.
I am installing a factory tapedeck in my 86 Carrera. Everything is mocked up and it works good. Of course I am doing this hot. I remove the power leads and while moving around they ground and I fry the yellow power lead to the ignition. I opened the harness back to the ignition switch and rerun the yellow wire. One ground melted so I replaced that. Re connected the radio and all is good. So turn car on and this is what happens.
I turn on lights and everything works in park mode and headlight mode as well dash lights work. I turn on ignition with light switch on park lights go out with headlights on and dash lights go out but they come on with signal lights. The front park lights get power from the headlights. I have had car insured for two months so maybe parks at front didnt work. Only driven twice at night. Same with dash lights but thought they were working. I swapoed out ignition switchs and same. Looks like it might be faulty light switch and it surfaced when this short happened or maybe was a previous issue and I just noticed. Any thoughts. Going to try used light switch tomorrow. Thanks Rob.

[mgro1959]

Tried a good light switch and checked several grounds but no change. Its like there is hot from ignition to light switch with key off but when key on it breaks this connection but switched connection isnt powering the park lights and dash lights. Any thpughts greatly appreciated. Thanks Rob.

[Dpmulvan]

Not the best electrical system to work on without disconnecting the battery. Track down a wiring diagram and get a good meter. Could be a variety of things start with relay.

[mgro1959]

As I mentioned dash and park lights worked until ignition was switched on. They went out. I bought a second lighting harness and bingo. I had sort of wondered if wiring that plugged into ignition module was wrong. As it turns out the grey and adjacent red on left top of the picture were wrong and reversed. This is how it should look. Now after about 4 hours of reading and hands on the journey has ended. Then car would not start but that was a bad solder connection in the DME relay. Never ends. Hopefully this will help some other poor soul that inherits someone elses wiring mistake. shoreversed

[mgro1959]

[7783911]

yellow also goes to 5 pin connector and you may have an issue ther, i had to pull everything and fix at all ends of the yellow