glow plug issue
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Senior User
Joined: Apr 2008
Posts: 132
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From: Peoria, IL
glow plug issue
My cousin got a 1995 7.3L. bought it last year does not use truck much but to pull camper around. so has long periods of none use time.
well late in the year glo plugs stopped working. timer light on dash still seems to time out like timer is working but wont start without small ether shot.
well decided to replace glo plug solinoid last friday. truck sat outside night b4 and temps in the 30's. changed solinoid turned on key light on dash timed out and behold like magic fired right up. did same all day friday and saturday. well come sunday morning was ready to return home from deer hunt and truck wouldn't start again. small ether shot again started right up.
he said he replaced the solinoid with a standard ford solinoid from auto parts store. like from older ford starter solinoid as it looked like the one he took off. my question, is the glo plug solinoid different from the the starter solinoid?
if not what else can be the problem? Thanx,
Jay
well late in the year glo plugs stopped working. timer light on dash still seems to time out like timer is working but wont start without small ether shot.
well decided to replace glo plug solinoid last friday. truck sat outside night b4 and temps in the 30's. changed solinoid turned on key light on dash timed out and behold like magic fired right up. did same all day friday and saturday. well come sunday morning was ready to return home from deer hunt and truck wouldn't start again. small ether shot again started right up.
he said he replaced the solinoid with a standard ford solinoid from auto parts store. like from older ford starter solinoid as it looked like the one he took off. my question, is the glo plug solinoid different from the the starter solinoid?
if not what else can be the problem? Thanx,
Jay
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Yes the glow plug solenoid is different than the starter relay solenoid. First, the timer on the dash isn't related to the glow plug on time, it's more of just a reminder. Grab a volt meter and check the voltage on the 2 large posts with the key off. One should be hot, the other dead. Have your friend turn the key on and see if you get voltage to the "dead" post for a few seconds.
If not, the relay is dead. Instead of using ether (not a good idea on a diesel with glow plugs) hold a screwdriver across the 2 large posts for 30 seconds. When you short the posts together, you're sending voltage to the glow plugs. If the relay tests good, he may just need new glow plugs. Stick with motorcraft on the glow plugs. Stay away from the autolite brand.
If not, the relay is dead. Instead of using ether (not a good idea on a diesel with glow plugs) hold a screwdriver across the 2 large posts for 30 seconds. When you short the posts together, you're sending voltage to the glow plugs. If the relay tests good, he may just need new glow plugs. Stick with motorcraft on the glow plugs. Stay away from the autolite brand.
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