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Old 05-03-2010, 07:37 PM   #1
sweet70beast
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51 GMC guages

I got this Jimmy a few days ago for free and want to get it running, I know that these GMCs are positive ground. If I make it neg ground is it going to mess up the guages? It is on a 1 ton frame but when I ran the vin it can back to a half ton long box. I have no idea when it was ran last. It has a Chevy dipper 235 in it which I'm sure is original to the 1 ton. I've had my Chevys for years but unfortunately I don't know much about GMCs.
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Old 05-03-2010, 07:39 PM   #2
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Re: 51 GMC guages

Sorry I forgot to put pics on.




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1970 Nova 327/T5 (my 1st car)
1971 K-20 350/350/205 (winter DD)
1953 GMC Suburban
1968 Chevy Bel Air
1976 Chev C-10
1972 Skylark (suncoupe)
1 of 3943 made
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Old 05-03-2010, 11:12 PM   #3
OrrieG
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Re: 51 GMC guages

I think stovebolt.com has a tech article on converting neg to positive. I know from experience on my dads 57 gmc bus it will cook a tape deck real fast if you wire it backwards.
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