dnl_paterson

Front pump seal? If so, you have to drop the transmission. Sent from my N9560 using Tapatalk

I finally threw in the towel and took it to my mechanic. I really prefer to solve these problems myself but this one put me through the wringer. He diagnosed it in a short amount of time; he knows these trucks pretty well. It's hard to believe a faulty ignition switches caused all of these problems. The switch managed to last 20 years and 300,000 miles so no complaints!

I Finally found out the problem. Bad ignition switch. Go figure.

Thanks for your reply. Do you mean the pig tail connected at the hitch?

Well I ran new ground wires from the block to frame to firewall. I ground all surfaces down to clean metal. I took off the negative battery cable and cleaned where it bolted to the front of the block and reinstalled it tightly. The problem is still there. I don't know what else to check.

I'm going to check the battery ground cable to engine block connection tomorrow. The ground strap from the block to frame to firewall looks pretty worn. Maybe replacing these will make a difference. I'll let you know what I find. Thanks green.

The blower motor. Everything shuts off just as if I manually turned it off

Well, I unhooked the battery, and everything stayed running. I also took it down to advance and had the battery and alternator load tested. Everything checked out OK. There must be a short somewhere? The peculiar thing is, according to the wiring diagram, the a/c, headlight dimmer, antilock and obd 2 port share the same circuit. Could I be on to something here? Do you guys remembering the old floor mounted dimmer switches? I remember when they went bad, you would press them and your headlights and dash flights would go out. I wonder if this could be the case for me. Maybe the dimmer switch is bad and causing all these problems?

Green, I'm going to unhook the battery while it's running with all the electricals on today and I'll get back to you. Thor, I'm going to do first what I mentioned to Green and see what happens. I may go ahead and load test the alternator down at the auto parts also. Thanks guys and I will let you know what I find out.

I just load tested the battery. It is good. Sent from my N9520 using Tapatalk

Thor thank you for your reply. I have not load tested the battery. I have however, tested the output of the battery with a multimeter. It is 12.4 volts. I have also tested the alternator and it is putting out above the battery voltage. I forgot to mention something else weird. When I hook up my scan tool when these lights are on, it reads “connection error.” When the lights go out, the scanner reads like it normally would. Sent from my N9520 using Tapatalk

Sent from my N9520 using Tapatalk

I have a 96 GMC suburban k1500. Sometimes the a/c will shut off and at the same time the parking brake and antilock light come on. It will do this for a few minutes and then both lights go out and the a/c comes back on. Both lights also come on sometimes when I flip on the bright lights at night. I looked over the wiring schematics for my truck but I can't seem to nail down what would be the cause of this. Anyone have any suggestions? Sent from my N9520 using Tapatalk