Roy..... .never heard of "gray water" except as it applies to your clothes washing machine discharge. Howsomevers, its possible that the previous owner might have used some radiator anti-leak stuff like "Bars-Leak" which is alumnium looking. This could also be responsible for your "overheating". You might also want to do a compression check to make certain that you don't have a bad cylinderhead gasket. That can also cause overheating. My advice, be prepaired to byte the bullet for a new radiator. You can have the radiator pressure checked and flow tested at a good radiator shop. Unfortunately, the cost of a "re-core job" is usually more than a new replacement radiator. As for your 12 volt conversion, some of that graywater could have gotten into your frontmount distributor and shorted out all your sparkies cap. Clean'em good. Oh yeah, loose alternator belt can also cause overheating..... ...Dell
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