Alternator Harness (plug)

Dcroteau

Member
So I very recently picked up a Ford 600 and don't know much about it except for what I am quickly learning by searching this board. It is sluggish starting and PO had to jump every time we started up (figured it was due to the cold) After getting some more time to look everything over I found a wire on the harness to the alternator almost severed (maybe that's why battery cant hold a charge?). It seems to have already been converted to a 12V system with an alternator, and it is a 3-wire plug. I called customer service about their harness assembly but it is a single wire harness. Anyone know of what kind of alternator this is, and where I can find a new harness/connector?

I need to give everything a good cleaning just in order to read any placards/ID plates. Appreciate the help, as I'll be posting a lot I am sure (hydraulic issues on 3-point)
 
Sure does not sound like the common Delco 10SI used on most. Look the alternator over real good and I'll bet you an find who made it or take it to a good auto parts store and have them look it over and test it and when they test it make sure you mark what wire does what so we can help you wire it up
 

Thanks, I know it is not of much help with no specs on the alternator itself...it's on my list to degrease her!
 
Is the plug on a harness hooked to the alternator? Some Motorola alternators had the regulator (a small box) mounted on the back end of the alternator and it had a short harness with a 3 wire plug which would connect with one on the tractor's harness. Take a look at the images of Motorola alternators on the web.
 
Can you repair the wire?

Unless it's broken up inside the plug, even then usually they can be repaired by replacing the wire terminal.

If the actual wire is still intact, not broken or burned in to, that is probably not the problem.

Easy enough to test the alternator, start it up, bring the RPM up, check the voltage across the battery. It should be up around 14 volts. If down around 12v, it's not charging.

Also check the belt tension and for wear. A simple test, try to turn the alternator fan with your thumb. It should be near impossible, or turn the engine instead of slipping. If the belt is loose and worn down into the bottom of the pulley, hard and glazed, it will need to be replaced.

If there is no charge, check for voltage at the back of the alternator. The large stud should have battery voltage at all times. The smaller 2 (a guess, not knowing the type alternator) should have voltage with the ignition on. Some alternators have a ground wire. It will usually be under an uninsulated stud, it will not have voltage.

If you still don't have charge, take the alternator off and get it tested at the auto supply. If bed they can likely match it up with an automotive application, way cheaper than going to the dealer!

Also take the battery in, have it load tested. A bad battery, having to jump start, can damage an alternator.
 

It could be that bad wire but just keep in mind that slow cranking 92 times out of a hundred is absolutely clean cable connections with corrosion or carbon from arcing in them.
 
Do the three wires go back to the gauge panel? Or is there just
one wire going to panel? If three wires go to panel one
small wire goes to indicator light other small wire goes to
switched 12 volts. If this wire is not switched it will drain
battery when turned off.

If only one wire goes to panel. (it is a three wire internal
regulated alt being used as a one wire) and needs a special plug
so it will not discharge battery when turned off. Can get plug
from YT. #ADR9209. @10 bucks.
 
(quoted from post at 13:54:46 03/20/19) Is the plug on a harness hooked to the alternator? Some Motorola alternators had the regulator (a small box) mounted on the back end of the alternator and it had a short harness with a 3 wire plug which would connect with one on the tractor's harness. Take a look at the images of Motorola alternators on the web.
mvphoto33208.jpg


mvphoto33209.jpg
 

It seems the taped single wire is the old wire to the generator? The frayed wire is right at the connector, it could probably be fixed by re-pinning it, but I would rather get everything set properly with new wiring, I always hate relying on previous owners setups...

One wire definitely goes to the solenoid, and every time I try and start there are sparks...didn't know it was arching from something (due to this bad wire at the alternator?) I also order all new battery cables.
 

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