Quote:
Originally Posted by benmack1
I understand what you are saying about the wiring but one thing still confuses me. I can measure good conductivity with the ohmeter from pin hole 1 to gp/nut 1 and etc for the other lines. I would expect the opposite if I am not measuring voltage down those lines when hooked and energized since the pins are hot. Also, all 5 lines seem to have failed simultaneously. It may be I am just too stupid to get it. However, I will ask at risk of the aliens getting mad, is there any situation that the relay kicks out and fails when it is under load to the gp's and would measure fine with only voltmeter 'load' and seem fine. These have seemed to fail overnight. I believe all 5 were fine as of last Friday. I had one bad one this past spring and it was very evident even during warm days.
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You are not too stupid to get it. Simple things with too many viewpoints can get complicated for all of us and hard to deal with. Everyone means well.
Take your meter and read each wire on the glow plug harness . If all readings are the same from the relay plug to ground the wires and glow plugs are fine. You are looking for one glow wire harness terminal that shows no resistance at all but instead a dead short. Or a ridiculously low ohmage value. You can calibrate your meter just by touching the probes together to see what it's zero ohms is. Remember you are reading very low ohmage readings so be observant.
An open line for example will not trigger a circuit breaker. So too much continuity is what you are looking for. Not a lack of it.
If this test shows all five wires to read about the same. You need a test relay. There are many reasons that relay can be open or shorted internally once current is demanded. If internally shorted it certainly is capable of getting warm. The internal circuit breaker still could be opening to deal with an internal relay short. I do not have a schematic but if the relay breaker is opening at least the key activation circuit is intact.
If the relay circuit breaker were to open with the glow harness off you would have proof the relay has a heavy short. Conversly if it only opens with the glow harness plug hooked to it you have a shorted wire or glow plug. It is not just a tired circuit breaker I believe as the relay gets warm.