glow plug light on dash for a 97' 7.3 - Ford Powerstroke Diesel Forum
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Old 05-04-2012, 11:52 AM
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glow plug light on dash for a 97' 7.3

It's doesn't light up...If the glow plugs aren't working would it kick a code? Also is the glow plug relay the same relay for the starter? I have a good spare and want to check to see if the one under the cover is bad. Whats a good way to trouble shoot glow plugs? The truck starts fine...

Last edited by Stankfanger; 05-04-2012 at 12:03 PM.
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Old 05-05-2012, 03:48 PM
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The glowplug relay and the starter relay are not the same. GPR is case-isolated and needs to be that way. If you use a starter relay (usually case-grounded) in place of the GPR the plug may work, but they will not shut off. You truck will onlt set a code for the glowplugs if it is a California-model 1997 that has the shunt on the GPR (has the GPR monitoring system). Is your truck starting? If it is and the Wait-to-Start light is not coming on, the light may just be burned out. If it is not starting, check underhood fuse #22. If it is blown, try disconnecting the fuel heater as it may have shorted (3 wires on the driver's side of the fuel bowl, it's the middle one ... top is Fuel Restriction sensor, bottom is water-in-fuel sensor). Replace the fuse and see if it starts (same fuse supplies power to the truck's PCM). Cheers!
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Old 05-05-2012, 04:09 PM
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Troubleshooting GPR & GP's
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Old 05-06-2012, 07:11 AM
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Thanks guys! Checking this morning.
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Old 05-06-2012, 06:14 PM
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The WTS light is not an idicator of whether the glow plugs are working. You could remove the GPR completely, turn the key to RUN, and the light would still come on. Either the bulb is burned out, or the wiring from the PCM is bad. This is presuming the truck is running; if it's not, it could be your PCM fuse #22 is blown.
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Old 05-14-2012, 02:36 PM
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Let me clarify, the WTS light comes on, the truck starts, I thought I remember the dash having the GP symbol lighting up as well on the dash. How do I diagnose the GP plugs. I hear on a cold engine. Test light on the postive, key on...Checking what????? It seems the truck is fireing off with a few more revolutions than normal. Could just be me but I thought at one time the was that curly light GP symbol was on my dash at start up. I replaced the GP relay already. Thanks to all of you for your input. You all are a big help. One day I hope to be able to contribute.
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Old 05-14-2012, 03:57 PM
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There is a sticky in the general 7.3 section on testing

I made my Samsung SGH-I997 send this.
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Old 05-14-2012, 05:24 PM
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Quote:
Originally Posted by jesilvas View Post
There is a sticky in the general 7.3 section on testing

I made my Samsung SGH-I997 send this.

thank you sir!
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Old 05-14-2012, 05:32 PM
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I woulda posted a link but I was on the phone.
Troubleshooting GPR & GP's
Different years but same idea.
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Old 05-14-2012, 06:09 PM
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There is no such dash light. If the truck is starting well, and the tests in the sticky come up good, you can call it a day. One rough indicator of whether the glow plugs are on is the voltmeter. It stays left of center after starting the truck; when it swings to the right, that's when the glow plugs have shut off.
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