Join Date: Sep 2010
Location: Huntington In.
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The front relay ( ASD ) you could swap with the middle one and if the truck won't start then the relay is bad. Your alternator is regulated by the ECM unless you have a external regulator on. The CPS on the front of the engine is what tells the ECM the engine is turning, it should have a .050 air gap.
The alternator needs to be grounded good, along with the frame and body.
The grid heater is controlled by the ECM, there is a intake air temp sensor in the intake manifold. It tells the ECM that the engine temp is below 60 and the wait to start will come on which means the grid heater is cycling. You can operate the grid heaters off a push button and use them when you need them, shouldn't until temp is 40 and below.
92 D250 parted out
97 2500 4X4 auto, 8 fuel plate, BD converter
96 F250 4x4 with 92 Cummins zf5