jacob dehart
Newbie
I have a 94 K1500 5.7 tbi. I was working on the trucks brakes and had started it to let it get warm as it has sat sone time while working on it. It suddenly revved higher and then went back to idle quickly and in doing so my battery light came on and voltage dropped from 14v to 9v. I immediately checked the battery and alternator output post and they were reading 12.03v at idle under minimal load. (no lights on or ac or nothing like that, just the door was open)
As for some back story I bought the truck and the alternator wire to the pos. battery terminal was not connected. When I tightened it down and made a connection I noticed my alternator was getting a bit hotter than what I considered normal after running at idle with minimal load. That being said I had replaced 2 alternators and the same problem reoccured. Within 20-30 minutes running at idle, I read alternator temps all the way up to 135-140 degrees which is quite hot to the touch.
The truck also has the “Big 3” upgrade to the charging system, which I had just added 2 bigger ground wires from neg. terminal to motor frame and body. It has new battery cables and alternator wire, as well as a new battery. Also I have no aftermarket options as far as electrical goes.
Anyone have any ideas why the sudden voltage drop on the dash but not to the battery and alternator? And any ideas on why my alternator is “overheating?”
As for some back story I bought the truck and the alternator wire to the pos. battery terminal was not connected. When I tightened it down and made a connection I noticed my alternator was getting a bit hotter than what I considered normal after running at idle with minimal load. That being said I had replaced 2 alternators and the same problem reoccured. Within 20-30 minutes running at idle, I read alternator temps all the way up to 135-140 degrees which is quite hot to the touch.
The truck also has the “Big 3” upgrade to the charging system, which I had just added 2 bigger ground wires from neg. terminal to motor frame and body. It has new battery cables and alternator wire, as well as a new battery. Also I have no aftermarket options as far as electrical goes.
Anyone have any ideas why the sudden voltage drop on the dash but not to the battery and alternator? And any ideas on why my alternator is “overheating?”