[bestgenman]

If your solenoid has three wires, red/black/white, the black & red are the hold in coil. The white is the pull in coil. If you can, look for voltage on the red & black while the plunger is depressed and engine running. even a test light will work. If no voltage then follow the "fire extinguisher" safety. They interrupt the negative to the coil with a pressure switch on the extinguisher which will be open when depleted. As mentioned, sometimes there is a bad connection to that loop. Newell used a four pin trailer connector on most.

If you have voltage then it is your solenoid, I keep them in stock and can UPS red one if you like.

Hope this helps and not too late.