Glow Plug Issue
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Freshman User
Joined: Feb 2015
Posts: 27
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From: Kentwood, La
Glow Plug Issue
I have a 1995 7.3L F250 daily driver. When I got the truck the glow plugs were not warming up, so I bought a new relay and put it on. Same problem. Both relays go off almost immediately after coming on. Because of that, I keep the truck plugged in at night, and it never gives me any problems since I live in mild temps. However, it has been colder than normal and I would like to figure out what is going on with it. I left it plugged in last night, and it still wouldn't crank this morning.
I have in the past, with another 7.3 jumped from one relay terminal to the other to heat the glow plugs when the relay failed. With the other, It would at least arc and get warm. Neither relay that has been on this truck has even arced.
Thanks in advance,
Tyler
I have in the past, with another 7.3 jumped from one relay terminal to the other to heat the glow plugs when the relay failed. With the other, It would at least arc and get warm. Neither relay that has been on this truck has even arced.
Thanks in advance,
Tyler
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Joined: Dec 2012
Posts: 11,266
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From: Las Cruces New Mexico
Humm, the one wire is always hot meaning its connected directly to the battery, have you made sure you aint got corrosion on the + side the battery connection?
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Lead Driver
Joined: Mar 2006
Posts: 5,097
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From: western SD
To me, it sounds like most of the glow plugs are burned out. Do as Knottyrope said in the first reply. Or check them with a test light by clamping the lead from the test light to the positive side battery post, the touch the pin to the glow plug with the tip of the test light. Ig the light comes on, the plug is probably good. No light the plug is bad. You can do this by unplugging the harness from the valve cover gasket. There are 2 plugs on each side. The pin layout is glow plug-injector-common-injector-glow plug, so you would touch the outer most pin on each plug with the test light. If you find the plugs bad, replace with the Motorcraft ZD11 plugs only, or you will be replacing them quite shortly.
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Thread Starter
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Freshman User
Joined: Feb 2015
Posts: 27
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From: Kentwood, La
Both relays, as in the one I took off, and the one I replaced it with.
Thanks guy, I will try to pull the valve covers this weekend and ohm out the glow plugs. I will post the results when finished.
Thanks guy, I will try to pull the valve covers this weekend and ohm out the glow plugs. I will post the results when finished.
Lead Driver
Joined: Apr 2016
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From: Bahstun
very possible
Mine did that last year and with a wire brush on GPR post, it worked fine again and I have a spare GPR now.
Mine did that last year and with a wire brush on GPR post, it worked fine again and I have a spare GPR now.