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In Car Power Supply +Mouse Uncontrollable

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Have a Tripp Lite PV375 Portable Auto Inverter 375W 12V DC to AC 120V 5-15R 2 Outlet with 2 plug outlets for common house hold 3 and 2 prong. Plugged laptop in one and Mark V Pineapple in other, connect with wired lan cable, Vehicle running, plugged trip lite into 12V outlet. Could not get mouse cursor to stay still enough to use. It would over jump and move on its own. I suspected it was power fluxations. I left the pineapple plugged in as thats the only power I had and unplugged laptop went to battery on it. Mouse cursor still jumping around. When I then unplugged the lan cable the mouse cursor was back to normal. But plug in the lan cable--forget it--jumping around. With just laptop plugged into tripp lite its fine.

It was working fine on home power.

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You probably have a ground loop somewhere. The laptop's probably has it's own rectifier and voltage regulater internally so that the dirty power from the car isn't affecting it. The Pineapple's power supply is probably not quite as sophisticated and is passing on the dirty (or more likely, square-wave) power.

You could get a pair of media converters and change your network connection to fiber and back, that would provide electrical isolation. You may also try a different inverter that generates a pure sine wave instead of a regular inverter, but that will not be cheap.

This is a common problem with cheapo power supplies for mobile devices. You can see an example of the wide quality differences in power supplies here: http://www.righto.com/2012/10/a-dozen-usb-chargers-in-lab-apple-is.html

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