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I was in a mess like this with my fuel gauge. Big surprise. I swapped gauge, NG. Put original back. Swapped sender, still NG. I then connected the new gauge and new sender together on the bench and supplied 24v to it. It worked perfectly. I swapped both into the truck, and the system...

None of the M939/A1/A2 were originally equipped with ABS. They all should have been MWO's to have ABS added, unless liquidated before the MWO went active. http://www.roscommonequipmentcenter.com/MWO%209-2320-272-35-1.pdf Battery may and should absorb any spikes, but an oscilloscope would...

Disagree. Going without it may cause voltage spikes into your system, and could fail electronics which are not protected against such, such as the ABS module (proven to fail) or the voltage regulator in the alternator. They added it for a reason. You'd have to put a scope on it to confirm...

It is needed because when the horn solenoid releases/closes, it generates a big spike that would otherwise go through the system, much like an ignition coil (they discharge their high voltage when power is removed and the mag field collapses). If your horn switch tests OK, then it is probably...

There is a diode on the ground side to dampen the inductive spike when the solenoid releases. This is wrapped in tape or shrink tube where the horn wire is grounded by the horn bracket. For my case, this diode was roasted and my horn stuck on. Not sure if this is the case for you.