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View Full Version : Alternator only engages after high RPM-fj60


84fishin60
02-03-2014, 07:33 AM
I recently installed a new Bosch alternator in my 60, it doesnt charge the battery until I rev the truck over 3k rpm, (4k is redline). But once I hit the magic number, once, volts stay close to 14. Belts are tight and wire connections are good.
Any thoughts?

MDH33
02-03-2014, 08:08 AM
I just went through a bunch of grief with the charging system in my 60. Mine was a combination of faulty alternator AND regulator. Since you just replaced the alternator, I would do the diagnostics on your voltage regulator. Or did the new alternator come with a new VR?

MDH33
02-03-2014, 08:11 AM
Here's the thread for my 60 charging issue. Some good trouble shooting info in there.

http://www.risingsun4x4club.org/forum2/showthread.php?t=20354

84fishin60
02-03-2014, 08:46 AM
Thanks for the reply!
The VR sits right on top of the alternator? If so, it did come with the alternator, but the car quest guy did change pulleys.

SteveH
02-03-2014, 11:58 AM
That's weird. I converted a Ford 9N tractor to 12v, using a GM alternator, and you had to design a circuit to excite the alternator into charging. After you started the tractor, you had to rev the tractor over 1200 rpm, at which point the alternator would begin charging. This was intentional and how the circuit was engineered to work.

In your case, perhaps you need to find the 'excite' (field?) wire to the alternator and watch its voltage as you rev the engine. Obviously, your case is not normal...

I would think an independent 'automotive electrical shop' (if you have any in your area) could give you some ideas, too. You need the old geezer in the shop that has a mountain of old starters on the floor and an inch of dust everywhere.

CardinalFJ60
02-03-2014, 03:05 PM
I would think an independent 'automotive electrical shop' (if you have any in your area) could give you some ideas, too. You need the old geezer in the shop that has a mountain of old starters on the floor and an inch of dust everywhere.

Vanatta's in Boulder. Walter is GREAT.

84fishin60
02-05-2014, 06:54 AM
Steve- thanks for that info, definitely worth looking into.

I think the first stop is the carquest to have the alternator checked. And go from there.

I havent taken the rig out of the county. Its a heck of a climb on I70 to get to the tunnel. Might take me 45 min to trek 11 miles, so I'm going to try to get this figured out up here.

MDH33
02-05-2014, 08:25 PM
I havent taken the rig out of the county. Its a heck of a climb on I70 to get to the tunnel. Might take me 45 min to trek 11 miles

Sounds about right for a 60! :hill:

84fishin60
03-02-2014, 09:21 AM
I love the problems that fix themselves!