I spent a couple hours chasing down a simple voltage problem this weekend. My engines glow plugs would not energize despite the solenoid clicking closed.

I checked all connections, cleaned, re-cleaned. This was simply a 10 gauge wire that carried the voltage to the solenoid and through to the glow plugs when the solenoid closed.

I jumped the solenoid to see if that was causing resistance(not). I was getting voltage readings that were slightly lower at the glow plug end. That should have tipped me off, and finally did, but the readings were close and intermittent. I cut the wire, crimped up a new one, and that was it.

But where was the problem? The old wire tested with the same resistance as a new piece. It has a factory installed splice that's still on the starter(now cut off). I'll have to wait until it's removed to test it, that's probably it.

It doesn't really matter, it was simply resistance somewhere in 2 feet of wire and connections. Sometimes it's best to just go new wire and connections.

Electrical problems are usually tied to this same basic problem, again and again.