Batteries??? Or something bigger.... - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 11-19-2013, 04:29 AM Thread Starter
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Batteries??? Or something bigger....

Ok my 02 7.3 has had an issue with the glow plug system since I got it. To be safe I just went ahead and put in a new relay and all new plugs. Didn't work. So I tried another better relay... Still didn't work. So I started to research and found that when grounding the system myself (alligator clip off the back nut on the relay to any random grounding point, it works!!! Any advice there?

Now for the new issue. The above stated has worked all last winter. But now. If I turn the key without grounding my system so they don't run. My battery gauge reads fine. But, when I ground them so they work the batteries drain and it shows on the gauge. Is it just that my batteries need replaced? I took my truck and had them tested and both tested 100% perfect but it was right after a 40 minute drive.

Side note.. Above 40 degrees or when my block heater is plugged in I have no issues.
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post #2 of 5 Old 11-19-2013, 06:00 AM
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To further diagnose this, what you need to do is see if the PCM is supplying that ground path. When cold, you should see that the wire you're manually grounding, and coming from the PCM, has ground.

If not, either there's something wrong inside the PCM <OR> the sensor the PCM relies on to tell it the engine is cold enough to use the GPs (the EngineOilTemp for the most part). So, if the engine knows it cold enough and doesn't supply ground then there's a bad component inside and the PCM would need to be replaced (or "lived with" a manual sw to do the job). If the PCM has no idea it's cold enough then the sensor (or wiring repair) would be all you need to make it work again...
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post #3 of 5 Old 11-19-2013, 06:03 AM
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This is interesting.

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post #4 of 5 Old 11-19-2013, 06:13 AM Thread Starter
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Thanks noralph. That makes sense. So, the issue I'm having now is with them draining my batteries is just most likely needing new ones? I couldn't believe they both tested 100% considering I've had the truck for 2 years and who knows how long they were in there before that. If you test them immediately after a decent length drive like I did is there any chance they could show weakness since they would be all charged up from the alternator?
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post #5 of 5 Old 11-19-2013, 08:55 AM
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I would think the "draining" issue is unrelated....

How were the batteries tested? They need to be Fully Charged, and Individually, Load Tested at a High Rate (not one of those, dinky, 100A testers the Auto Parts use. But at 250-300A for our Big Batteries) to know they're all they should be.

This is the time of year when marginal batteries are first put to the test
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