Alternator battery down in
Thread Starter
3rd Gear
Joined: Feb 2018
Posts: 3
Likes: 0
From: Ringgold Ga
Alternator battery down in
Hello everyone this is Tird dog first post hoping to get some knowledge my 74 will drain the battery will drain down within 3 day I pulled all the fuses and used my amp meter to. I’d possible circuit problem amp meter shows 660 milliamps on the pos voltage lead to battery. and see if I could locate my shorts that way I could not find anything other than Transit voltage you know however when I pulled the plug with two wires this gm alt it is a three wire type so is it possible the exciter in the alt is drawing this 460 mill amp when I got to the alternator and also the one marked batt. from the alternator goes back to the battery immediately when I pull the two wires from the alternator went from 560, mill amp c Vet was not running the mill amp went immediately to around 110 mill amp not running to approximately 110 I think I read the exciter lead keep the alt charging while turning at slow rpm helping keep lights bright at idle any way I could sure use some help pointing me in th right direction the forum is great thanks
Melting Slicks
Joined: Mar 2005
Posts: 2,094
Likes: 298
From: Midlothian VA
Hello everyone this is Tird dog first post hoping to get some knowledge my 74 will drain the battery will drain down within 3 day I pulled all the fuses and used my amp meter to. I’d possible circuit problem amp meter shows 660 milliamps on the pos voltage lead to battery. and see if I could locate my shorts that way I could not find anything other than Transit voltage you know however when I pulled the plug with two wires this gm alt it is a three wire type so is it possible the exciter in the alt is drawing this 460 mill amp when I got to the alternator and also the one marked batt. from the alternator goes back to the battery immediately when I pull the two wires from the alternator went from 560, mill amp c Vet was not running the mill amp went immediately to around 110 mill amp not running to approximately 110 I think I read the exciter lead keep the alt charging while turning at slow rpm helping keep lights bright at idle any way I could sure use some help pointing me in th right direction the forum is great thanks
Welcome to the forum!
Bad/leaking diode in the alternator will exhibit the issue you've described. Easy to test and fix. See the thread linked below for more info.
Try the info found in this post.
