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New Trombetta GP relay installed and the truck fired right up after allowing the wait light to go out. Glow plug controller seems to be working great as well since the GP system continued to fire the glow plugs for a brief period of time after start up (afterglow). Now we are off to the local...

Thanks for the reply. After testing the glow plugs, we found 3 that were bad. My son and I installed 8 new 13G glow plugs and are awaiting the delivery of a new made in the USA glow plug relay from Murcal due to that fact that the old, original relay would not energize. It should be here this...

Well I went ahead and ordered the Trombetta brand GP relay - made in USA. The local Napa had the ST85 but it was made in China. Just picked up the set of AC Delco 13G glow plugs and noticed that the spade terminal is wider than the Wellman 070's that we removed. It looks as though it is 1/4"...

Good news to report. My son and I were able to easily remove all 8 glow plugs - none were swollen. Out of the 8, we had 5 that checked good for continuity and heated up like they should. 2 did not pass the continuity check and did not heat up and the last one (cylinder 8) checked good for...

What brand/part number should I try to find in terms of the GP relay?

Today was rather chiller here in Michigan and I am trying to diagnose a "no start" condition on my newly acquired 1986 M1009. Seems as though it is the glow plug system. I have been going through the glow plug diagnosis manual and have found that I have 24V coming out of the ballast resistor...