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Old 10-02-2015, 01:00 AM   #1 (permalink)
jkbowen
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Possible Short? Glow Plug and Low coolant lights stay on FOREVER!

Hi folks. I've never had a diesel before, but thanks to this site, i've learned a whole lot already. Ive been looking hard at what might be the issue, but im finding nothing.

Heres the facts:

1: Truck sat in a driveway for about 14 years until i got ahold of it. Towed it home, because it wouldnt start. It started right up for me after i put a couple batteries in it. The reason it sat forever was because the front brake constantly locks up, and it locked up in the driveway and they never figured to pull it out with another truck... Beyond me as to why, but worked out for me.

2. After i had it running for a couple days with no problems, i ran out of gas. I was unaware at the time how much of a PITA it is to get the fuel primed up to the IP and get it started, but it worked after compression starting it while being pulled down the street. Yeeha!

3. The glow plug lights were working fine, cycling on when key turned while motor cold, then cycling off and then i'd start it. No problems, until i ran out of gas!

Heres where im confused:

After it got started back up again, it would cycle the glow plug light on, then wouldnt turn off. I was alarmed, so I didn't drive it. Well, necessity forced me to check it out to see if my plugs were indeed coming on. It still runs perfectly fine, NO PROBLEMS, except that the glow plug light stays on and no matter what, will not come off. I just noticed that the check coolant light was still on after i put coolant in it earlier. I unplugged the Glow plug relay right next to the driver side battery, and BOTH the GP and low coolant lights turned off. Am i correct in thinking that this is a short? If i bypass the relay and put in a switch, will that solve my problem?

Any advice is greatly appreciated.

Thanks,

Josh

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Old 10-02-2015, 01:03 AM   #2 (permalink)
jkbowen
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If the plugs were staying hot the entire time, wouldnt that break the motor, or at least the plugs, which wouldnt allow me to start? I started it this morning in like 36 degree weather, no problem.

Is it a short connecting the lights together or grounding them or something and just turning the light on?

Finally, will this whole thing be nothing to worry about if i put in my own switch to the GPs, bypassing the relay?

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Old 10-02-2015, 01:04 AM   #3 (permalink)
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I was studying wiring diagrams earlier and saw that the GP light and the low coolant light are connected by a ground if i read it right?
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Old 10-02-2015, 03:57 AM   #4 (permalink)
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Yes, they have a common ground if your working on a early build GP system, round controller and separate GP relay.

BTW these are really easy to convert to manual GP's if you want to.
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Old 10-02-2015, 04:28 AM   #5 (permalink)
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Quote:
Originally Posted by jkbowen View Post
I was studying wiring diagrams earlier and saw that the GP light and the low coolant light are connected by a ground if i read it right?
If you have a 82-84 round controller at the rear drivers side head heres an easy override.
https://www.dieselplace.com/forum/63-...-solution.html

Your low coolant sensor is on the passenger side radiator tank about 6 inches down. You may have bumped the wire off the sensor. If its off you can ground it out to test if its a short. When you ground the single black wire the light should shut off on the dash. Check your starter has the front brace. Welcome to Dieselplace! Watch out for any assassin
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Old 10-02-2015, 04:55 AM   #6 (permalink)
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As JC alluded too, what year is your truck? The 82-84 controller failed all the time.
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Old 10-02-2015, 05:06 AM   #7 (permalink)
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Its a Chevrolet 1982 c20 with the 6.2l v8.
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Old 10-02-2015, 05:19 AM   #8 (permalink)
jkbowen
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Sorry for my short response. I was on my phone.

I just tried grounding out the connection on the sensor and it didnt shut the light off....

Is it burning out my glow plugs? I've disconnected the whole harness that comes out of the rear side of the glow plug relay, but the light still stays on. Does this mean theres a short?
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Old 10-02-2015, 05:31 AM   #9 (permalink)
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In all likelihood, the controller is shot. The early ones were junk. Rewiring to the 85+ solid state controller or a manual button is probably a better choice than replacing it.

As to whether the plugs are getting power, only a test light or meter can tell for sure, sometimes it allows a trickle and burns out plugs.
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well to make your pump retarded, you could let it hang out with me for a day
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Old 10-02-2015, 05:56 AM   #10 (permalink)
jkbowen
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I have a push button switch i'd like to use. So....

wire 1 from battery to switch wire 2 from switch to what, the glow plug controller thats up on the passenger side behind the head if i remember reading right earlier?

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