Grounded loop and auto enginuity question. - Ford Powerstroke Diesel Forum
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Old 04-06-2013, 05:27 PM
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Grounded loop and auto enginuity question.

Okay I have an auto enginuity and a crappy laptop. The battery life on the laptop during the daytime (full screen brightness so you can see) is about 20 minutes. I plan on getting a windows 8 tablet as AE can run of them apparently, but not for a while.

Using a power invertor and charging the laptop off that cigarette lighter while plugged into the PCM is a big no-no because they share a circuit I know that.

My truck also has a "power point" right beside the airbag on/off switch. And I think this is on a different circuit. I know it's on a different fuse.

Am I understanding the grounded loop issue right? I should be able to charge the laptop off that power point, and be plugged into the PCM right?
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Old 04-07-2013, 12:31 AM
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I would say no.

I had a 97 that I tried to run the laptop off a direct tap from the batteries and it had a ground loop issue with that. The only way I can think of not have the ground loop issue is to use a Isolated ground inverter, though I never tried it.
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Old 04-07-2013, 05:58 AM
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I remember seeing Burnt Pins in a USB cable when doing this. AE says it's a Big N0-N0 and you can't do it no matter where you pull power from. It's not about something as simple as a ground circuit that's shared with the PCM.

Do you have a Starter Pak? You know, one of those 12v portable jump start batteries? If you kept that charged (how many of us have 1/2 charged starter paks ) and plugged the inverter into that it should last a good, long, time...
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Old 04-07-2013, 12:02 PM
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So basically I would need a third battery, with a circuit on its own.

Windows 8 tablet it is lol
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Old 04-07-2013, 12:04 PM
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Yeah, additional battery would be the way. But, any excuse to get a new toy!
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Old 04-07-2013, 12:25 PM
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Actually hang on. As I understand it.


I could run a third battery and have it charged off the alternator, just anything I run off it needs to ground back to the battery itself, not to the body/frame? That would be simple enough. And I have a load of 0/1 sitting around.
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