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Old 12-09-2007, 02:46 PM Rookie

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glow plug

My glow plug keeps blowing the circuit in my garage everytime I plug it in. With the wet winter weather, are there any tips in keeping it dry or drying it before I plug it in? Could it be something else that is causing it?
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Old 12-09-2007, 02:55 PM


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It could be alot of different things really.

You could simply be overloading the circuit. Do you have alot of stuff running on that one

Is the cord frayed at all?
Also the cord on the block heater or the heater itself could be bad
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Old 12-09-2007, 03:00 PM
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I believe you are talking about the block heater not the glow plugs, they are 12 volt and work off the truck batteries every time you turn the key on. The block heater is 110 volt and warms the engine coolant when plugged in. Are you using a GFCI outlet and is it tripping the GFCI or the breaker? How many amps is your circuit rated for and how big of an extension cord are you using? These things pull a lot of juice and require at very least a 15 amp circuit and 14 gauge cord. If it is tripping the GFCI or a 15 amp or larger circuit then it is either in the truck cord or the heater element. It is pretty easy to take the cord loose and check it with an ohm meter to make sure it is not shorted internally anywhere. If it is tripping the GFCI and the cord is good then it is probably a bad heater element. The element should be located just above the oil filter. Some guys here use a plug mounted in the bumper just like goes on a boat, it is water tight and cool looking. I have my plug mounted on the driver’s running board so I can hook/unhook with one hand and can’t forget about it. Never ever use a non GFCI protected circuit.
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