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This is NOT a 6V Ford example, but I work on newer electrical systems a lot. Had a Dodge Caravan that was having all kinds of strange electrical issues. Different lights dimming or not working, tail light issues, sometimes didn't want to start, gauges not working. Nothing obvious was wrong so I did some reading up on this model car and it was a common problem. Lots of stories of dealers changing everything under the sun at high expense with nothing fixed. So, a couple of folks claim that all it needs is the ground to the engine cleaned. I take the ground connector off and it looks very clean, no major crude at all. But, I have it off so I scuffed it and the mounting surface up, lubed it and tightened it back down. All problems solved! I was amazed that such a small film on a ground could cause this much havoc. Now, this was a car with a lot of electronic controls which are far more sensitive to this type of thing, but still a good lesson on the importance of good grounds. And good grounds are even more important with 6V than with 12V.