'83 GMC 6.2L not chargng battery's
 

Ok so I am the new and proud owner of a 1983 GMC Suburban with a 6.2L diesel that has an aftermarket banks turbo. Now a few wonderful weeks of fun diesel driving and one morning my truck does not want to start up, my battery's are completely dead.

So I took them out of the truck, set them on a low amp deep cycle charge for each batt for 24 hours. I put the battery's back in truck, it ran for 4 days before it was dead again. That's the background story. So far I have changed the rectifier in the alternator, put a new alternator in, checked the wiring to the batterys, spliced and installed a new pigtail that connects to the alternator, looked behind the dash and the wiring harness, checked the engine compartments wiring harness, tracked most of the wires to everything and still I am loosing power. :argh:

HELP ME!!!! :ouch:

Jeff

sounds like a short draining something

Sorry not rectifier but regulator

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But where is the question? Any advice or possibility's maybe something I over looked anything would help. Hell send options

when your batteries are charged make sure everything is off in the truck and even keep the keys out of the ignition, take the positive battery cable off and slowly move it back toward the hot post on the battery, while watching very closely see if there is a spark between the post and the cable end just before connect. it is easier to do it at night so you can actually see a spark. if there is a spark then you have a drain. then take a fuse out of the fuse panel and try it again and replace the fuse and repeat with every fuse until you do not see a spark, at least this will narrow it down to one curcuit. purchase a haynes repair manual and it should tell you what components are connected to that particular curcuit,and then check every wire on the curcuit.

Have you checked to see if it has a burned out fuseable link wire on the alternator output? An easy way to check for that is take a test light or volt meter and check for power on the output wire. If it has no power with the engine stopped look for the fuseable link.

welcome to diesel bombers and check this thread out and see if theres any thing that will help and let me know so we can look into it further if we need to https://www.dieselbombers.com/1st-ge...lternator.html

charge the battreys and let them sit not hooked to any thing a day and recheck 1 bad battery will drain both of them. Also have the alt checked at a shop.

reply
 

Thanks for the info I will be looking into that. maybe I might find it with your idea's.

J

I ran into a problem one time a long time ago , I dont know if your starter has a solenoid on the starter itself or on the firewall , I should look at my own truck its a 83 , but I had the problem where the battery was going dead after days and I found out that the solenoid on the starter was draining my battery .. I know it might be far fetched and a rare thing , but that is something to think about if you cant find it anywhere else . lol worse case scenario go to auto zone tell them to hook it up on there machine and run the diagnostic , they will be able to tell you if your alt is spitting enough juice out .. and its FREEEEEEEEEEEEEEE :jump: