okay damn, all my glow plugs are open and they were all unplugged, probably bad controller failing to always hot. 'putting in new zd1a plugs
I believe that I can jump the glow plug relay hot post to one of the small posts, then run a wire from other small post to a momentary switch in the cab. Ground the other side of the momentary switch. This should give me manual control of the glow plugs. My question is do I leave the original controller plugged in to the harness or not? It was always plugged in but every one of the glow plugs were disconnected. Also when I turn on the key there are two terminals of my 8 terminal harness connector which connects to the glow plug harness that are pulsing? Is the latching relay?