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Thank you for the kind words and for letting me know that your cards arrived intact. I would like to extend a Thank You to all that have purchased GP cards. The next version will be out soon. Karl

Tim is right. The GP system will draw 100 amps with 8 properly working glow plugs. This is an actual measurement of 4 AC60G glow plugs in a M1009. Full scale is 50 amps.

If the temp sensor fails in the open mode (high resistance) or is unplugged, the card will see the high resistance and will close the glow plug relay. The card thinks the engine is cold with high resistance from the sensor. If the temp sensor fails in the closed mode (low resistance) or the...

By Pass Wire Here is a picture of the wire installed on the GPD series GP controller. I used a flat washer on the top of the original nut and a second 4-40 nut on top of the ring terminal. If you ground the wire coming off of the transistor, the GP relay will close. It would be a good idea...

Let's just say a new version is in the works.:-D:-D

PM sent.

Here is a little known fact about the GPD-2B and 2C cards. The cards we make are very easily modified to add a manual push button to it and keep the original GM wiring intact. No splicing is required to add a push button to our card. The long machine screw that holds the large transistor to...

This is a good source for relays for the GP system. http://www.murcal.com/Catalog/Metal-DC-Contactor-Family/974-1215-011-09 I have used them in several trucks and other applications at work, so far no issues with them. Karl

Same here. Someday you or a friend will need it.

New cards are available at http://www.glowplugcards.com or http://www.hillbillywizard.com

Crossover Gasket GM 23500846 NAPA FPG 35357 Thermostat GM 14028916 NAPA FPG 35271 and THM1040ST

I wonder why my 8 GP's only draw 100 amps? They are AC60G plugs. The first picture is 2 plugs, the second picture is 4 plugs. Full scale is 50 amps. These readings were taken from a truck that is not using the resistor. These readings were taken with the GP system is being powered from the...

Seems like the card is working properly with the temperature sensor disconnected. If possible measure the resistance of the temperature sensor when it is cold and again when it is hot. It should have a high resistance (around 3000 ohms) when cold and low resistance (around 250 ohms) when hot...

The glow plugs can stay on for as long as 45 seconds after the engine is started. By disconnecting the temp sensor you have a high resistance to the GP card in a cold condition. Plugging the temp sensor back in gave the GP card a lower resistance and it turned the relay off as it should. The GP...

Tony, Can you verify that all all of the Orange wires connected to the glow plug side of the relay? Also, try disconnecting the temperature sensor and see if the issue still happens. The wait light staying on until the high idle drops is really odd. It's possible that the wiring has been...

Check all the battery connections and the wires themselves may be suspect. This thread may help find a bad connection. http://www.steelsoldiers.com/showthread.php?72880-Battery-Wiring-Maintenance&highlight=battery

I asked a judge about the cargo restriction and PA Antique vehicles. His interpretation of cargo was that it implies being paid to transport the objects or materials. Cargo is also defined as freight, freight implies being paid to transport materials and goods. Splitting hairs here with the PA...

Did you gravity feed the fuel pump to verify that it is working?

Gravity feed the fuel pump to see if it is working properly. If it is, you should be able to bleed the air at the fuel filter and the truck should run. This means you have no fuel getting to the lift pump. If you can not get fuel out of the filter, your lift pump is bad. You may have more...

Thanks for the kind words. Unfortunately all of the GP cards with the additional heat option have been sold. It was a limited production run and most likely will not be offered again. Karl