dristar,

You should put this post in the Diesel Discussion section. You will get more answers.

Measure the voltage across each GP when they are operating. You should have about 1.5 volts across each one. Place the voltmeter terminals as close as possible to the GP when measuring.

If the voltage is higher across the #1 GP, there is something wrong with the reisitance wires between the plugs.

P E H

P E H