The glow plugs do not work when I press the glow plug button in the cockpit.
I have 12V at the “s” terminal on the solenoid when I press an hold the button
I have 12V on the always hot side of the solenoid coming from the starter
The fuel pump works when I press the glow plug button
The glow plugs are verified good because I jump the heavy 12V from one side to the other and the engine fires immediately when starting from cold. It did not start prior to jumping the solenoid and attempting to preheat the glow plugs by pressing the button.
I have an open circuit across the “s” and “i” terminals on the original solenoid, and I replaced the solenoid with one from Napa auto, GPR500.
Same exact symptom with the new solenoid except there is a closed circuit between “s” and “i” as I would expect.
I believe I have a ground issue with the solenoid as it doesn’t not click or is there 12V on the “i” terminal when pressing the preheat button.
The original solenoids mount ran down to the base of the solenoid, like a shelf if you will that the solenoid sat on and has the 4 rivets to the plastic housing.
The new solenoid mounts to the top of the solenoid and hangs, and is not electrically attached to the bottom of the solenoid.
I suspect the original solenoid gets its ground through the base and mount.
The original solenoid has no part # or manufacturer name.
Any suggestions?