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Thread: Where to buy new PMD and Harness?

  1. #11
    Join Date
    Sep 2007
    Posts
    372

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    While I was getting the air out, I noticed something looked "off". I tugged on the wires and it turns out the glow plug controller relay is broken. I can get one from Walt for $69.99.

    Three questions. First, is there something that causes this to happen that I need to address?
    Second, I am not a mechanic but it looks like it shouldn't be difficult to remove and replace, or will I need to tow it to a shop?
    Third, It has been a while but the last time I plugged in the glow plug warmer it caused the circuit breaker in the garage to pop. I assume it is related to the broken glow plug relay. Do I need to do something to avoid messing up the new glow plug relay?

    IMG_0753.jpg IMG_0751.jpg IMG_0755.jpg
    Last edited by RipnRun; 03-19-2022 at 05:42 PM.
    1997 Silverado 1500 6.5. with 200,000 miles. New fuel injection pump at 132,000 mi. FSD Heat-Sync in bumper hole, marine fuel injectors, air induction kit all from Walt at 148,000 mi. Replaced OEM Fuel Filter Assy, wastegate solenoid valve, OPS and relay at 155,000 mi. Harmonic Balancer replaced. Red dot and White dot EGR replaced. New starter, Instant Heat glow plugs, and glow plug relay/controller at 180,000. Replaced hydroboost and master cylinder in 2016. New Interstate batteries 4/13/19.

  2. #12
    Join Date
    Feb 2007
    Posts
    2,956

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    I buy a lot of parts from Walt and rockauto, compare prices. The two securing nuts are 15 mm, I don't know the terminal ones, easy replacement. The mains plug-in heater is a block heater element, low down on the drivers side of the engine, half way along, it heats the water in the engine. I have never had a GP relay break, and the retaining threads on the suburban one, must be nearly worn out from removing it so many times to remove the head. Someone else had the breaker pop from the block heater, and I think it was because of salt on the heater. It is difficult to remove, even with the engine out of the vehicle. If you are thinking about replacing it, let me know, I will send photos of one removed, and how to release it, I deleted it on the new engine, because the temperature here does not drop below 60 deg F, I also only have one battery in each vehicle.
    Last edited by grancito; 03-19-2022 at 07:12 PM.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, new engine, 0 miles. 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

  3. #13
    Join Date
    Sep 2007
    Posts
    372

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    Thanks, please do send the pictures. At this moment I'm thinking that I'm too old and fat to crawl under the truck again. But I said the same thing right before I replaced the starter last time.

    Do I need to unhook the batteries before I mess with the glow plug relay?
    1997 Silverado 1500 6.5. with 200,000 miles. New fuel injection pump at 132,000 mi. FSD Heat-Sync in bumper hole, marine fuel injectors, air induction kit all from Walt at 148,000 mi. Replaced OEM Fuel Filter Assy, wastegate solenoid valve, OPS and relay at 155,000 mi. Harmonic Balancer replaced. Red dot and White dot EGR replaced. New starter, Instant Heat glow plugs, and glow plug relay/controller at 180,000. Replaced hydroboost and master cylinder in 2016. New Interstate batteries 4/13/19.

  4. #14
    Join Date
    Feb 2007
    Posts
    2,956

    Default

    Yes, remove the ground leads from the batteries. Here are some photos, in the first two you can see the side of the block where the heater fits in the rusty hole. The next is the outside of the heater, the plug is difficult to remove, lever it off with a screwdriver. In the center is the retaining screw, it needs to be unscrewed a lot, as the unit has to be partly extracted and moved sideways to let the clamp come out. The last photo shows the clamp mechanism unscrewed, if you unscrew it too much, part of it will disappear into the cooling part of the block.SAM_0328.jpgSAM_0328.jpgSAM_0331.jpgSAM_0332.jpg I don't know if any of the photos got attached, this site is difficult for me and pisses me off. OK the second photo is the first but not important, at least some were posted.
    Last edited by grancito; 03-20-2022 at 01:41 PM.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, new engine, 0 miles. 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

  5. #15
    Join Date
    Sep 2007
    Posts
    372

    Default

    I bought the cheaper of the two glow plug relay options from rock auto. My son commented that it felt kind of "cheap" compare to the original. I guess he was right, it broke during installation. I did not crank down hard on the nut, it just popped right out through the plastic. I am sending it back and ordering the more expensive option.

    [ATTACaH=CONFIG]966[/ATTACH]
    Attached Images Attached Images
    1997 Silverado 1500 6.5. with 200,000 miles. New fuel injection pump at 132,000 mi. FSD Heat-Sync in bumper hole, marine fuel injectors, air induction kit all from Walt at 148,000 mi. Replaced OEM Fuel Filter Assy, wastegate solenoid valve, OPS and relay at 155,000 mi. Harmonic Balancer replaced. Red dot and White dot EGR replaced. New starter, Instant Heat glow plugs, and glow plug relay/controller at 180,000. Replaced hydroboost and master cylinder in 2016. New Interstate batteries 4/13/19.

  6. #16
    Join Date
    Feb 2007
    Posts
    2,956

    Default

    Oh, that was unfortunate, it is necessary to buy quality sometimes, but with a lot of purchases, I have had success with the cheap brands. I look for their recommended parts, often just a little more than the cheapest.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, new engine, 0 miles. 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

  7. #17
    Join Date
    Sep 2007
    Posts
    372

    Default

    Good news! The old truck is up and running again. Thanks for the guidance Grancito.

    It could be my imagination but the more expensive part felt sturdier out of the box.
    1997 Silverado 1500 6.5. with 200,000 miles. New fuel injection pump at 132,000 mi. FSD Heat-Sync in bumper hole, marine fuel injectors, air induction kit all from Walt at 148,000 mi. Replaced OEM Fuel Filter Assy, wastegate solenoid valve, OPS and relay at 155,000 mi. Harmonic Balancer replaced. Red dot and White dot EGR replaced. New starter, Instant Heat glow plugs, and glow plug relay/controller at 180,000. Replaced hydroboost and master cylinder in 2016. New Interstate batteries 4/13/19.

  8. #18
    Join Date
    Feb 2007
    Posts
    2,956

    Default

    Really good news, pleased to be of help.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, new engine, 0 miles. 3.73 diff, 16 mpg
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, since 1992.

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