2 bum alternators make one working!

[Keith_J]

A few weeks ago, I drove mkcoen's M35 to the Monster Truck Jam, the voltmeter was sick all day and had to jump it off the M1009 and slave charge. Tried to bump the regulator up, no deal.

So today I had the time to swap the alternator out. Took the regulator end off his "spare", only to see it had horribly worn brushes and tons of brush dust in the regulator-rectifier housing.

And the other spare he had wouldn't turn, the interior fan was hitting the rectifier cooling fins with damage on the nose, indicating it had dropped. But it had not turned a bit since receiving the new brushes, regulator and rectifiers.

The stator and rotor windings of the worn replacement checked out so we swapped the good brush/regulator/rectifier housing. The stator windings (delta) are soldered to the reg-rect-brush housing, easy work with a 40 watt iron. Installed it and voila, voltmeter is at 28.5 volts!

Now I will have to rebuild the failed one. Probably brushes. But I need to build an alternator test bench.

Like always, getting it done on a shoestring budget!

 

[OPCOM]

It's good that you repaired the alternator. Wish you had pictures of it, would be very interesting.

 

[Keith_J]

If I had a source of rectifiers and regulators, I could overhaul these easily. Bearings and seals are standard. As are brushes.

I have another one to fix, the one I pulled. Will be sure to take pictures. Bear in mind there are 4 alternator "models", they are virtually interchangeable with only minor difference in the output connection eye needed. They have the SAME NSN and Ord. PN but use slightly different components, save brushes and a few bearings. And the same TM covers all, 9-2920-225-34