Glow plug controller
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Glow plug controller
My 1991 F250 7.3 IDI "Wait To Start" light goes off after only 4~5 seconds. The truck doesn't immediately start because I think the glow plugs aren't heated enough. I checked all 8 glow plugs with a test light and all indicate OK. If I leave the switch on for another 10 count, it starts right up.
The light on my 1991 F350 with the same engine stays on around 12 seconds and the engine always starts right up. Is the controller bad on my F250?
The light on my 1991 F350 with the same engine stays on around 12 seconds and the engine always starts right up. Is the controller bad on my F250?
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Junior User
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I did the quick continuity check with a test light only. I believe I read somewhere that the resistance should be less than 6 ohms off the vehicle.
I bought this truck 7 years ago from the family of the original owner. It still has less than 90,000 miles on it because it sat for 12 years in a barn. Pretty sure these are the original glow plugs. Old age could be wearing them out from sitting.
I bought this truck 7 years ago from the family of the original owner. It still has less than 90,000 miles on it because it sat for 12 years in a barn. Pretty sure these are the original glow plugs. Old age could be wearing them out from sitting.
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Junior User
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Thanks, guys. You are probably right. My '91 F350 is also a low miles truck, but is still 26 years old. I replaced all glow plugs on it a few years ago because 3 of them actually checked bad with a test light.
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