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6.5L Turbo Diesel 1992-00 6.5TD - Discussion forum for the 6.5L engine.

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  #11  
Old 01-21-2018, 02:08 PM
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JohnC JohnC is offline
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How are you determining that there's a ground in the glow plug harness? IF you're measuring it with an ohm meter, the glow plugs are such low resistance that they will be indistinguishable from a short to ground. You need to disconnect all the glow plugs first.

That said, if the glow plugs heat then there's no short in the harness.

Why do you think the glow plug circuit is causing the battery to go dead?

I went back and looked at your original post. The problem was that the starter was buzzing, right? Was that caused by a dead battery? A buzzing starter can be caused by a bad (high resistance) ground. This problem will not lead to a dead battery, though. And, I don't think there's anything in the glow plug circuit that will drain the battery when the key is off.
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Last edited by JohnC; 01-21-2018 at 02:35 PM.
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Old 01-22-2018, 09:47 AM
gsimpson gsimpson is offline
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I used an ohm meter at the back of the fuse box, it says there is a short with no key in the ignition and no batteries in the vehicle. When I touch it to the lead that is pluggeed into the glow plugs it also reads there is a short.

So you are saying that the glow plugs always show a grounded state?
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Old 01-22-2018, 11:31 AM
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Quote:
Originally Posted by gsimpson View Post
So you are saying that the glow plugs always show a grounded state?
If you measure from the glow plug harness at the relay to ground you will see about 0.1 ohms, hard to distinguish from a short.

If you're using an ohm meter on the fuse box, I hope you have the battery disconnected, or are on the circuit side of the fuse box with the fuses removed.
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"Compassion" - a politician's willingness to arrange the transfer.
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Gone but not forgotten: '87 F350 7.3, '91 C2500 6.5, '95 K2500 6.5, '06 K2500HD 6.6
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