alternator problems please help!!!!!!
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Junior User
Joined: Jun 2010
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alternator problems please help!!!!!!
well i just changed the alternator on my 78 f 250 i upgraded from a 42 amp alternator to a 65 amp and lo and behold its not charging all the wires are in the right place and i even replaced the voltage regulator and still no charge i dont know what the hell is goin on could somebody enlighten me? i even had the local o reillys to have them test it since i bought it from them and thought i had a bad alternator this problem is about to make me want to drive it off a cliff. it has a 300 straight 6 please help
Post Fiend
Joined: Sep 2006
Posts: 14,325
Likes: 14
From: Island Southeast Alaska
It would help to know how You know it is not charging? How have you trouble shot it? Have you checked out put at the alt.? Or does the gauge say no charge? Have you taken the Neg cable off with it running at a high idle?
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
As for the original problem - measure the battery voltage with a multimeter while the engine is running, and report back with the results. Without the right tool, you'll only chase your tail.
Senior User
Joined: Apr 2007
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ditch it and all that factory wiring....get a 130 amp alternator off a ford taurus...the 3.0's had the small case 3g and the 3.8's had the larger 3g. In the case of the v8's you'll need the smaller case, though I think either will work. I think the same applies for you. Run a 4 gauge power wire with a 200 amp fuse from the back post of it to the plus side of the starter relay. Get this cable from paperformance.com or make you own using a 200 amp circuit breaker and 4 gauge wire avail at any autozone. Run a key on 12v to the alt, and connect the final wire back to the plus on the starter solonoid too...that's it. Throw your old voltage reg and alternator in the trans, yank out and cut out all your factory wiring and enjoy your 130 amp bullit proof alternator.
Senior User
Joined: Jun 2004
Posts: 455
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Hey Sniper, Check out some of this action.
https://www.ford-trucks.com/forums/9...g-upgrade.html
This is what v8only is talking about.
https://www.ford-trucks.com/forums/9...g-upgrade.html
This is what v8only is talking about.
Senior User
Joined: Apr 2007
Posts: 300
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when I picked up my 66 mustang, all the original wiring to the alt was cut up and non functioning...this mod was so cheap and easy, and eliminated all factory wiring, it was a no brainer. It charges 14.7 volts at idle now, lol and cost me a whopping $25 from the junkyard and $35 for the harness.
I just ordered up another harness and am about to do this very same thing to my 77 f150, as the charging system in it is starting to exhibit problems.
I just ordered up another harness and am about to do this very same thing to my 77 f150, as the charging system in it is starting to exhibit problems.
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New User
Joined: May 2010
Posts: 24
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first trace your wires from the alternator to solenoid. if those look good. I had a truck someone put a custom stereo in. The jack a$$'s at Audio Express cut the wire from the ignition to the regulator. hooked the stereo up to it, but didn't hook the regulator side back up. also, check the plug at the regulator those tend to get brittle (or is that just an Arizona problem?) and break.
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Thread Starter
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Junior User
Joined: Jun 2010
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i figured out what it was orielly's gave me a fried voltage regulator but they warrantied it out and gave me an even better one than i purchased to begin with so charge prob solved (p.s. that was after about 2 hours sitting in the oriellys parking lot fiddling with the thing)
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