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Thread: Where to buy new PMD and Harness?

  1. #1
    Join Date
    Sep 2007
    Posts
    372

    Default Where to buy new PMD and Harness?

    My truck won't start all of a sudden after running great for the past few years. In the past, it has always needed just a new PMD and 6 foot harness. I installed a new harness and what I thought was a never-used PMD (can't remember for sure, but it is probably 8-10 years old). My truck cranks but won't start.

    For years, I have been buying my harnesses and PMDs from Pensacola Diesel. To be fair, this PMD is very clean but might not be new/unused. I do know that the harness is new/never used but it doesn't seem to fit right like the previously purchased ones have.

    2 Questions
    1. Where is the best place to purchase a new pmd and extension harness?
    2. What do I need to do to make sure the PMD/harness ground is adequate??

    Thanks
    Kenny Wright
    Last edited by RipnRun; 03-09-2022 at 10:30 AM.
    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. #2
    Join Date
    Feb 2007
    Posts
    2,956

    Default

    I bought a kit, PMD, Harness, and cooler, from South East Power systems Of Daytona on Ebay $220 in 2015, it is still good, the reman IP from Pensacola at the same time is good. The PMD needs to be grounded to the IP, the heat sink does not need to be grounded.
    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. #3
    Join Date
    Sep 2007
    Posts
    372

    Default

    Thanks Grancito. years ago, I relocated the PMD and heat sink to the bumper hole (I will move it if I need to). I do seem to need a new pmd every 2-4 years. I did just order a new pmd and harness.

    How do I ground the PMD to the IP? Is just plugging the new 6 foot extension harness into the original plug good enough or do I need to add or splice a new ground wire?
    Last edited by RipnRun; 03-10-2022 at 02:18 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.

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

    Default

    Just the plug will work. The ground was mounted from the plug, to a PMD retaining screw on mine, so when I removed the PMD, I connected the ground to a different screw on the IP. I have been saying that the PMD is grounded to the IP, which is not really the case, it is the ECM that has a ground to the IP. The PMD on my suburban is 15 years old and the truck, 7 years. It is mounted in the bumper hole on the suburban, and under the bumper on the truck.
    Last edited by grancito; 03-11-2022 at 04:04 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. #5
    Join Date
    Sep 2007
    Posts
    372

    Default

    OK, thank you!
    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. #6
    Join Date
    Sep 2007
    Posts
    372

    Default

    Well unfortunately brand new PMD and harness didn't help. The truck cranks but will not start. it had been running fine but it has been sitting for 2 months (couldn't get it to start). Any suggestions?
    Last edited by RipnRun; 03-15-2022 at 01:15 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.

  7. #7
    Join Date
    Feb 2007
    Posts
    2,956

    Default

    First look at my last post, it has been edited. Sitting for so long likely means the fuel has drained back to the tank. Loosen 2 injector nuts, make the lift pump run, not sure how on your model, while bleeding the fuel filter, then see if the fuel comes out of the injector lines while cranking. This technique gets air out of the IP and it can inject, always works for me.
    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.

  8. #8
    Join Date
    Sep 2007
    Posts
    372

    Default

    Thanks, I can bleed the fuel filter and I have a switch wired in the dash so I can run the pump with the key turned on.

    I know this is a stupid question but where exactly are the injector nuts that I loosen?
    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.

  9. #9
    Join Date
    Feb 2007
    Posts
    2,956

    Default

    On the drivers side of the engine, at the front, are two injectors that are easily accessible, they have small steel tubes running to them, I loosen them a bit and all of my engines that ran out of fuel, and the new one, started quickly.
    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.

  10. #10
    Join Date
    Sep 2007
    Posts
    372

    Default

    Thank you very much!
    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.

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