k, every couple days i have to put the ole'-timer on the battery charger.... i dont think its the alternator, its the way its hooked up.... cuz it was working fine with the last engine, i just transfered it over... what does it need to charge? what needs to go where¿¿¿!!!,





tryin to get this truck highway operable, mostly electrical is givin me problems

Did you do any welding on the truck?


To test the alternator, take the power lead off, put a test light on the power stud and touch the other end to the cable you took off. If it lights up, you have a bad diode in the alternator, and it is draining your batteries.


Next test the batteries, see if one is bad, they can develope a short internally that will drain them over a couple days.

I haven't done any welding but i am doing everything my self as far as changing the motor over and electrical...

Sometimes when you are welding on the truck it will zap a diode in the alternator, that will cause the alternator to drain the batteries. It will still charge, not as well, but most people wouldn't notice except the batteries keep going dead.

Ive now tested the Alternator and it is definately capable of creating a charge and is not draining the batteries, now i just need to know how to hook it up...oh... and is everything supposed to be magnetic??? like the alternator intake manifolds...pretty much everything able to be magnetic is... is that normal?

A magnetized motor is not normal. Not sure how you could do that.


There only needs be one wire to the alternator. One from the big stud to the batteries, that is all that is required. The others are not needed.

Is the magnetism going to effect anything? will it hurt anything?
There are several wires going to the Alternator. I think they might be the lights and things going to the stud, then there is a plug with a bigger red wire going to the alternator and a small white one that has power only when engine is running, im assuming that one would go to the batteries?

You must have a newer 6.2. If you are not sure it is hooked right, just unplug it after driving, if you still need to charge the batteries in a couple days, your problem is elsewhere.


I don't have a diagram for anything with that many wires, do you have a haynes diesel manual, it is probably in there.

Does anyone have info on the magnetism? its kinda wierd, alot of people ive asked said theve never heard of that happening...

don't remember the exact cause of magnetism but when happens to some of the bigger truck engines it has resulted in broken crankshafts. i agree it's not normal and you have to find out the cause before something else happens. do you have all the grounds to the engine? add a good heavy one just for *hits and giggles, but from past experience on the 6.2 you can't have too much ground. another possiblity is beltsas they go round they can build up static electricity.make sure nothing is rubbing where it shouldn't.

Ill have to check it out........ been doin ALOT of work on er', ill have to double check everything. Thanks.... ill run a couple more grounds too, if i find out whats causing it will post it.

I don't know what would cause it to be magnetic but the intake manifold it aluminum so it can't be.


Is it magnetic all the time or just when it is running? If all the time, is it still if you disconnect the batteries?

yeah, u wouldn't think the intake manifold would be, but my wrench sticks to it...... it sticks to the alternator too, and the body panels, just the front ones near the engine.....

its gotta be sutm under them