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So... While working on my glow plug issue (something was shorting near the starter), I moved the vacuum lines in a way they didn't appreciate. The line from the pump snapped in two. Looking at the edge of the broken line, it was in progress for some time. It appears that I may not have a wiring...

AK, I started working on the glow plug issue (since the wiring problem may be related) and haven't double checked the vac pump. It's possible that it's heating up and seizing, but I don't think it would be intermittent. I can still see the white paint on the back side of my belt, so I don't...

Grounds all checked out with the ohm-meter, but as a friend point out, merely having low resistance doesn't indicate that they can carry any current. I'll try cleaning/redoing them tonight since I have to pull the inner fender to check glow plugs. There's a part of me that wants to pull the...

Thanks for the feedback. This is really starting to get frustrating! I feel like a break in the wire would have duplicated the fault when I shook the harnesses, but I could not get WG vacuum to drop off. The only changes I had made when I test drove yesterday were unfastening the glow plug...

94 C1500 6.5TD with no glow plugs coming on (no dash light either). I disconnected the glow plug harnesses from the relay and tested the relay as OK (12v on GP lug as long as they are disconnected when the key is turned to start). After disconnecting the glow plug lug, and checking resistant...

OK, wires to ECM are good and no amount of jiggling/tugging on the engine bay wiring was able to duplicate the no WG vacuum condition... Going to swap the WG solenoid and see if that improves things. Still want to make sure the vac pump is always pulling vacuum, but I'm not driving the truck...

More to check tonight! I appear to be able to turn the vacuum signal on and off by accelerating and decelerating too. Think it could be engine movement in the rat's nest at the back of the intake?

So jumper from PCM out to solenoid? I guess if I can jiggle the PCM wires and turn it off/on that would prove it out. Is there also a ground near the PCM which could be bad? The truck is a 94 C1500, but lead a sheltered life travelling to Arizona every winter for many years. Never seen salt or...

Thanks FellowTraveler, I noticed a fray in the yellow wire (conductors exposed, but look good and shouldn't be able to contact anything since it's covered in loom). Is there any way to check those wires easily for signal/B+ or Ground at the WG solenoid connector?

Thanks! Was going to try that tomorrow. I'll let you know what I get.

Hello all, I've been dealing with low boost/no power for a week or so. Finally hooked up a boost gauge and went one step further by connecting a vacuum gauge to the WG actuator vacuum line. The situation is: Truck has boost/WG vacuum as intended when cold. Eventually truck warms up and WG...