86 with 88 7.3l battery draw

[ramdriver15]

The girlfriends (OSU86Diesel) truck is beeing a pain in the rear. has a battery drav, spliced over the 7.3 engine harness and this draw showed up. Cant figure it out. we ave disonected all the harneses and the only time it goes away is when the interior connector is removed and the alt. regulatr s disconnected....


this thing is killing me

 

[NJKen]

It sounds like the alternator is not powering down. The field is staying energized and that will kill a battery.
Do you have the original style (Gen1) alternator that has an external regulator or the new style (Gen2) that has an internal regulator? If it has 2 plugs it is internal (not likely on a diesel) if it has 1 plug and 1 Lug for the batt+ it is most likely external. Either way, you need to figure out what is energizing the alternator or voltage regulator (if external).
Ken

 

[NJKen]

Also, Alternator batt+ should be hot all the time but everything else on the alternator should only be hot when the key is the on position.
Ken

 

[ramdriver15]

Also, Alternator batt+ should be hot all the time but everything else on the alternator should only be hot when the key is the on position.
Ken

new altinator, and wires are always hot?? could the regulator be bad???

 

[tknomaj]

[The field wire for alt should only have power with key in on position check that wire and correct and problem like ken said should go away

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[NJKen]

I just found the other post on this. The poster states that the vo;tage regulator is warm to the touch after a few hours. This tells me that the regulator is staying energized when it whould not be. Correct that problem and everything should be fine again.
Ken