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Old 08-16-2008, 09:18 PM
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Ground problem.

I have installed 6-way adjustable power seats in my '73 chevy. I am lucky as the plug is but 2 wire. I installed a new buss box in the wheel well to handle the extra power need. Where should I ground out the seat ground connection? It would be easiest to ground it to the floor, but I am wondering if I should ground it elsewhere.

Any suggestions?

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Old 08-17-2008, 07:46 AM
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I dont like floor grounds, there are just to many potential issues. Find an area where the wire wont be easily disturbed and clean it real good before attaching.
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Old 08-17-2008, 08:33 AM
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(it's a bit of a none issue because you don't adjust the seats constantly but)

best ground path for the longest possible device life and best operation is always a bigger than correct size copper wire direct to the batt neg post...

drill and mount a piece of a copper (toilet bowl bolt) threaded rod thru the firewall....
add grounds jumpers from all the interior devices (heater blower/radio/wiper motor/seats/etc) ground screws to the stud...
(now each device has multiple ground sources to draw from)
use a #8 or #10 wire from the batt neg post to the engine side of the stud....

it's fair to think of a 12VDC neg ground system as the positive post is pulling the energy from the neg post thru the device and back to the batt...

so having a way more than needed extremely low resistance and multiple paths of negative side supply available is always a good thing....
(because a car on tires can't have a true "earth" ground source)

edit add: I'd use a #10 ground on the seats, they do pull alot of amps...
(bored waiting for my wife, I let my son play with the seat for maybe 20 minutes...killed the batt, had to jump start the car....)

Last edited by red65mustang; 08-17-2008 at 08:40 AM.
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