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What's a good source for them?You said one key thing that makes me believe dash ground. When you mess with the heater controls and the dash lights turn on.
They are coming ON with the heater controls because some power source is looking for ground and it finds it through the dash lights.
This is also one of the reasons that people doing their own repairs should spend a few dollars and buy the factory EVTM for their vehicle. It would let you see every ground point... what all is tied in with it and where on the vehicle it is located.
I just bought one for my Bronco II on EBay.What's a good source for them?
The EVTM is wiring diagrams. It’s everything you need to know about the wiring and vacuum systems for that vehicle. It shows where connectors and components are. It shows pin outs of connectors. And so much more.I used to have one for my Aerostar, but I've had Rangers off and on for several decades so I'm not in a big hurry for something for them. Especially with the internet / You Tube, I can get most specs I need that way.
My only current dilemma is a lighting wiring diagram for the '03 Ranger. Want to do some wiring for tow flat tail lights. I think the rear tail light wiring comes up through that huge plug under the drivers seat. If it does, I'd like to put the isolation diodes there inside the cab instead of in the back. No sense in going all the way to the back if I don't need to as well.