Alternator

[B.O.B.]

Possibly could be looking for a new alternator. While running, battery only at 13 volts. From what I can tell it’s original type alternator. I have 302 running mustang efi , newer stereo and mostly LED lights. Original wiring in truck as well. Should a 75 amp work well enough for all the accessories and not dry the original wiring?

Alternator I have now is in the pic. I have had it for 17 years (came with the bronco). So do not know how old it is.

[Jesus_man]

I would think that if it's pumping out near it's advertised amps, you shouldn't have a problem. Could be your battery getting old too?

There are shops in Denver that can rebuild these and get more output from them. It was years ago when I did this sort of thing, so perhaps those businesses are no longer??

[B.O.B.]

New battery and just had the alternator tested “good”. Tracking down possible other issues right now.

[phyler]

Really only leaves the voltage regulator doesn't it?

Mine went out on me and caused all sorts of weird issues till I figured out it.

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[B.O.B.]

Well that makes sense. I mean it doesn’t have many miles on it, but it probably is 15 years old. We all know how some of this new electrical stuff works on these old trucks.

[B.O.B.]

Update: swapped regulator and it went back up to 14.46 volts while idling. Went for a drive later and started acting up again. Made it home and checked and it was back down to 13volts. I must either have a bad wire somewhere, or possibly the regulator crapped out already.

Any ideas now?

[B.O.B.]

Got a new alternator that was supposed to be an upgraded unit but similar to my old one. Wiring doesn’t quite line up though. Any thoughts on how I can wire this up? Or do I need to get a different alternator?

PiXD are old one, new one, wiring

[phyler]

Maybe @viperwolf can chime in? Bet he knows off the top of his head.

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