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Help locating a ground in the rear

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Old Apr 27, 2019 | 10:06 AM
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Default Help locating a ground in the rear

I have a 73 coupe that I am installing a powered subwoofer in the rear compartment. The ground wire has to be no longer than 30". Where can I find a good ground to connect to seeing that it is mostly fiberglass back there.
Thanks for your help.
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Old Apr 27, 2019 | 10:21 AM
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the battery? or drill thru and go to frame
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Old Apr 27, 2019 | 10:33 AM
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Could I connect it right to the negative terminal on the battery?
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Old Apr 27, 2019 | 10:40 AM
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Should be a ground on the rear compartment light.
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Old Apr 27, 2019 | 11:01 AM
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That's true, I will check that out.
Thanks
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Old Apr 27, 2019 | 03:09 PM
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Drivers side rear grounding location for radio antenna. Left of gas tank. Clean the area for a good ground/less than 30" away I believe using the exit/grommet out he back of the rear storage compartment.
Originally Posted by mjpetisce
I have a 73 coupe that I am installing a powered subwoofer in the rear compartment. The ground wire has to be no longer than 30". Where can I find a good ground to connect to seeing that it is mostly fiberglass back there.
Thanks for your help.
Reply
Old Apr 27, 2019 | 03:12 PM
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Go to the battery- go there for the power too. The rear compartment light ground wire is way to wimpy for something like a sub amp- you are only asking for problems.

Richard
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Old Apr 27, 2019 | 03:50 PM
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Great, thanks for the info.........
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Old Apr 27, 2019 | 03:52 PM
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There is a wire coming off of the negative terminal on the battery, can I use that?
Thanks for your help.
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Old Apr 27, 2019 | 05:41 PM
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no. I think that is a smaller gauge wire like 16. You need at least a 10 wire so run new to neg battery. What kind of cable end do you have on battery. If the spare wire is 10 use it. It would help to know how much power your sub draws to determine wire size
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Old Apr 27, 2019 | 06:55 PM
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Originally Posted by henrikse
no. I think that is a smaller gauge wire like 16. You need at least a 10 wire so run new to neg battery. What kind of cable end do you have on battery. If the spare wire is 10 use it. It would help to know how much power your sub draws to determine wire size
It is a smaller gauge wire. It is a 300 W powered sub woofer that has the right gauge wire and I would have to connect it directly to the negative terminal. Thanks for your help
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Old Apr 28, 2019 | 07:54 PM
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I went to and from, right from the battery with a subwoofer wiring kit. Had fuses , wiring and connectors. It was cheap money and help tremendously
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