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Re: Alternator spikes
Most likely Volts Regulator, If your alt is older then 72 it Reg. is on the body motor bay. If it 73 and newer in the ALT. The Reg maybe starting to go bad on it's way out. I would keep eye on and get it tested, could blow up the Batt for over charging at worst melt wiring or burn up ALT, or ruin batt. Pretty easy to fix or if you can't get a new ALT if that part bad.
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 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed
Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change.
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