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It got cold in PA and the early 99 7.3 ambulance has been hard to start. I put on a new glow plug relay and it did not help. I figured the glow plugs aren’t working and followed the gpr troubleshooting procedure.
* The new glow plug relay does turn on and off. With the key on there is power to the post on the glow plug side. It kicks off after approximately two minutes.
My next step will be to test the resistance of the glow plugs.
Picture from a camping at a moto trials event over summer
Yellow wire goes to driver side valve cover pluslg and splits off to 4 separate wires right before the valve cover plug. Brown goes to passenger side and does same thing. Got to be shorted to another power wire in the engine harness somewhere between there and the valve cover plugs.
Where are you attaching your test leads exactly? With the ignition off check continuity between those brown and yellow wires and B+ and B-. What do those readings say?
@udsuth78 I think I was using the multimeter incorrectly. I had one lead on the positive side of the battery and the other on the glow plug relay. The detached wire is grounded to the block and I thought it had power.
I turned the key on and ran back around to the front of the truck to check the realy. It worked as it was supposed to and timed our after a minute or two, but I tried a second time and there wasnt any power across the glow plug relay. I was doing this by myself. I need to try it again with a helper so I can check as the key is turned.
I guess my next step is measuring the resistance at the plugs on the valve covers to see if the glow plugs are bad?
It happens. The day that I go a full 24 hrs without calling myself a ********* is the day somebody better start digging a hole, because I must be dead. If you do find any bad plugs remember, only use known Motorcraft or Beru replacements. Anything else is just flirting with disaster.
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