Quote:
Originally Posted by bpeters2
I tested the voltage at the glow plug tip (wire still connected to glow plug) and it was only 9 v. I also tested the voltage coming out of the glow plug relay (tested all 5 male probes) and it was 12v. Both of these tests were conducted when the glow plugs were being activated. Does the fact the voltage seems to drop at the glow plug mean anything.
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If the test was performed properly, it indicates that there is high resistance in the wiring from the glow plug relay to the glow plug itself. This would be practically impossible on factory wiring unless it's been damaged in some fashion........
Just for the hell of it...........test the other four glow plugs in the same manner..........see if they all read 9V.
There is one other possibility:
If the battery is very weak, the system voltage will drop severely when the glow plugs are activated. So, check the battery voltage during the 30 seconds when the glow plugs are activated...........see if it also reads 9V. If so, then you can forget about testing the other glow plugs.........you need a new battery.