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Author Topic: 1991 Chevy c1500 electrical troubleshooting  (Read 15750 times)

Mr.B

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #100 on: April 03, 2015, 06:22:09 AM »

I don't know if any survived the purge of moving. But I'll look through my electrical crap that I did save.
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White '94 YJ 2.5L 5 speed, 35" BFGs KM2's, 5" lift, Mark VII 2 speed fan, Milemarker PE8000, Front Aussie Locker, Power steering conversion, '98 Cavalier seats, MORE Boomerangs in front, 136 amp ZJ alternator, JB conversions SYE, Tom Woods custom drive shaft, 8.8 with ARB, 4.88 gear ratio, Teralow

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Screaming Bear

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #101 on: April 05, 2015, 09:35:27 AM »

Got the brake controller from doug's friend today. Will mess with it tomorrow.
Did you try it?
I only skimmed through your owners manual. Don't forget to purge the Jeep booster of air and the EvenBrake before handling!
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51 CJ3-A, 4.3 TBI Chevy, SM420, Dana 18TC, 30/44 Full Floaters, Yukon Front Axle and Hubs, rear drive flanges, Detroit Fr / E-Locker Rr, 4.27:1 Gears, 74:1, HD steering / 4 wheel disk brakes, Viair 550C, 100% LED - VisionX headlights, Rigid Light-bar, DOT Fogs, Grote tail, Soft Top and Heater, 35"KM-2's, 3" up, no articulation - it works

pdangerp

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #102 on: April 05, 2015, 11:36:38 AM »

The jeep booster? How do I do that?
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Screaming Bear

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #103 on: April 05, 2015, 12:34:37 PM »

The jeep booster? How do I do that?
Step on the brake a few times to deplete the vacuum in the Jeep booster. Create a "dead pedal", no power assist.
The Even-Brake has a push-button air bleed to relieve the pressure before moving the unit. !!!!

The brake-away wiring is a no-brain'er. JJ said you don't need the optional brake-light signal with the 9300. "Program level" on first install. Better read the user manual, I have a different model.  :biggrin:
« Last Edit: April 18, 2015, 10:07:27 AM by Screaming Bear »
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51 CJ3-A, 4.3 TBI Chevy, SM420, Dana 18TC, 30/44 Full Floaters, Yukon Front Axle and Hubs, rear drive flanges, Detroit Fr / E-Locker Rr, 4.27:1 Gears, 74:1, HD steering / 4 wheel disk brakes, Viair 550C, 100% LED - VisionX headlights, Rigid Light-bar, DOT Fogs, Grote tail, Soft Top and Heater, 35"KM-2's, 3" up, no articulation - it works

pdangerp

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #104 on: April 20, 2015, 08:32:30 AM »

Ben and I hooked the jeep up to the truck again yesterday. We wired some trailer lights and took it for a test drive. Still no working brake buddy but we went to shingle springs and back and it seemed to climb the hills okay. I don't have a tachometer or transmission temp gauge so I'm not sure what the best speed for climbing is. We were doing about 45 mph up the grade out of folsom.
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timatoe

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #105 on: April 20, 2015, 09:27:17 AM »

What's happening with the brake buddy?
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pdangerp

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #106 on: April 20, 2015, 09:46:55 AM »

I am waiting for the breakaway switch to be delivered.
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Screaming Bear

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #107 on: April 20, 2015, 02:17:04 PM »

I am waiting for the breakaway switch to be delivered.
It will work without it, just not legal without one. That circuit is normally open, closes when the pin is pulled.
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51 CJ3-A, 4.3 TBI Chevy, SM420, Dana 18TC, 30/44 Full Floaters, Yukon Front Axle and Hubs, rear drive flanges, Detroit Fr / E-Locker Rr, 4.27:1 Gears, 74:1, HD steering / 4 wheel disk brakes, Viair 550C, 100% LED - VisionX headlights, Rigid Light-bar, DOT Fogs, Grote tail, Soft Top and Heater, 35"KM-2's, 3" up, no articulation - it works

timatoe

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #108 on: April 20, 2015, 07:53:45 PM »

Oh, well at least it's not an actual problem with it.
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pdangerp

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #109 on: May 15, 2016, 05:07:15 AM »

https://youtu.be/DqGNc7gE3uo
Saving this video for when I can catch my breath out here and work on stuff again.


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pdangerp

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #110 on: May 15, 2016, 05:16:32 AM »

Also, I finally solved my intermittent reverse light/turn signal failures. The connector for the tail light housing had some crappy contacts that had lost spring force over the years. I put a small pick in there and bent the contacts out enough to give them firm contact on the connector.
In short, the answer was, it's a Chevy and they're not built very well.


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timatoe

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #111 on: May 15, 2016, 10:03:18 AM »

https://youtu.be/DqGNc7gE3uo
Saving this video for when I can catch my breath out here and work on stuff again.


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That's basically the same column in the YJ and most every GM car through about 30 years.  Anyhow, it looks more difficult than it actually is.  Just make sure you get that spring compressor tool (about $14).
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pdangerp

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #112 on: May 15, 2016, 03:04:43 PM »

That's basically the same column in the YJ and most every GM car through about 30 years.  Anyhow, it looks more difficult than it actually is.  Just make sure you get that spring compressor tool (about $14).
Is it the same one as Randy's old yj? What broke in his to give him the wobbly wheel?
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timatoe

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #113 on: May 15, 2016, 08:30:45 PM »

Pretty similar.

His entire inside busted apart.  I wouldn't worry at all about that.  That's the only one I've ever seen do that.  My first car was a '76 Camaro and it had the wobbly wheel too.  I replaced the column on that because it was pre-internet and I didn't know how to fix it.
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pdangerp

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1991 Chevy c1500 electrical troubleshooting
« Reply #114 on: February 07, 2017, 10:24:53 PM »

Updating this old thread. I finally fixed the damn steering column. The truck had been sitting a lot because of the poor performing air conditioner. I started driving it this fall and it was very apparent that there was something wrong with the brakes and the steering column was going to fall off any day. Additionally, I developed a coolant leak, tail light was out, and a headlight had filled with water.
I royally screwed up my back around thanksgiving, and have been out of commission until 3 weeks ago. Now that I'm up and moving, I've replaced the headlight housings and bulbs (how I used to drive with those dim pieces of crap I don't know), I fixed the steering column, added bed tie downs for my new atv, replaced the leaking water pump (out of the weep holes), and the tail light is next.
Edit: the brakes were bad due to leaking wheel cylinders and those have been fixed.


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timatoe

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #115 on: February 08, 2017, 12:24:16 AM »

Good deal.  Glad to see it's still kicking.
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pdangerp

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #116 on: February 08, 2017, 12:33:31 PM »

Good deal.  Glad to see it's still kicking.
Kicking my ass... I hate electrical gremlins. Every time I take that tail light apart, it works. Put it back together and it lasts about 2 miles.


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Mr.B

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #117 on: February 08, 2017, 01:20:23 PM »

Probably a bad ground or connection.

Get some of this stuff:



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White '94 YJ 2.5L 5 speed, 35" BFGs KM2's, 5" lift, Mark VII 2 speed fan, Milemarker PE8000, Front Aussie Locker, Power steering conversion, '98 Cavalier seats, MORE Boomerangs in front, 136 amp ZJ alternator, JB conversions SYE, Tom Woods custom drive shaft, 8.8 with ARB, 4.88 gear ratio, Teralow

You're a super genius....
The difference between stupidity and genius is that genius has its limits. -Albert Einstein

pdangerp

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #118 on: February 08, 2017, 04:15:12 PM »

Bad circuit board. I guess the last one only felt like lasting a couple years. I didn't check it initially because it was relatively new.


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pdangerp

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Re: 1991 Chevy c1500 electrical troubleshooting
« Reply #119 on: February 14, 2017, 03:03:26 PM »

Thermostat stuck open. Went to remove it and this is what the bolt looked like coming out.


That bolt took about 20 minutes.


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