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Old 04-27-2014, 10:22 PM   #1
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Best rear ground point

I am in the middle of putting in an aftermarket sound system. The amp was to big to fit under the seats so I'm just putting in in the rear compartment. Where is the closest ground to that location? From what I can find everyone is saying the rear seat bolts, but I must not be looking in the right spot because the rear bench has no bolts that I can find.

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Old 04-28-2014, 11:13 AM   #2
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You should be able to use the seat belt bolt. Just make sure you get good, clean contact. I don't have my Jeep with me to verify it but I believe there are ones back there.

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Old 04-28-2014, 01:06 PM   #3
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Yeah I was thinking of trying that. The only issue is that the bolts are huge. Like the circumferance of my middle finger. I don't have any crimp connectors that large. I could probably find one at the hardware store though. Just looking for another option if there is one back there.
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Old 04-28-2014, 01:18 PM   #4
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Well any bolt that goes into the tub or frame should be good to go.
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Old 04-28-2014, 04:41 PM   #5
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Right. I just didn't see any bolts that wern't going through plastic, and was wondering if anyone new of any that I might be missing/
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Old 04-28-2014, 08:23 PM   #6
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Well just because it's going through plastic doesn't mean it doesn't go in to the tub or frame. Is it a 2 door? I believe it is since no seat bolts. Tell me where you are mounting it and I can take a peek at mine tomorrow to see if I can find something for you.
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Old 04-28-2014, 08:39 PM   #7
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Good clean metal. Any bolts that go through to metal should work. Or run the wire back to the battery.
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Old 04-28-2014, 09:19 PM   #8
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It is a two door. Thank you. I understand that if it is going through plastic it will still work since it eventually goes through metal under the plastic. So as long as I can get the connector under the plastic to put the bolt through it should work. The problem is with those going through plastic there is an inch or two of plastic until the bolt so unless my connector is a couple inch long fork or something theres no way to get the connection. I'm trying to avoid running back to the battery. A) That is much longer than the recommended ground length. B) I don't have enough 4 gauge on hand to reach anyway. Thanks for everyone's input, let me know if you turn anything up.
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Old 04-28-2014, 09:45 PM   #9
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Tap and thread a foot lug right into the floor, nice and neat, right where you need it......scuff the paint under the lug for a better connection
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Old 04-29-2014, 06:15 AM   #10
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The bolt itself becomes a ground when it is screwed into the tub or frame. Therefore, even if there is plastic between the connector and the tub, the connector should be grounded against the bottom of the bolt head. As long as it is tight and the bolt is not painted. That said, it would be better to have clean contact to both the tub and bolt. But I will still poke around in mine when the sun comes up.
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Old 04-29-2014, 08:20 AM   #11
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Okay. I took a quick look around and came up with 4 options.

1. Seat belt bolt - It's really not that big of a bolt. If the lug you have on the end of the ground wire is a circle, you could cut some out of it to make it more like a "U" and slide it under the bolt.

2. Cargo tie downs - The tie downs have a metal plate on the bottom. You could run the ground between the bolt head and the tie down plate.

3. If you have a soft top, there are holes on the rail where the hard top bolts down. Just pick up the proper size bolt and use one of those.

4. If you remove a tail light you will see there is a tub substructure there. By removing the corresponding trim on the inside, you would be able to drill whatever size hole you prefer and run a bolt through there. With the tail light removed, you would have access to install a lock washer and nut on the bolt.

That's after a quick glance. I'm sure there are many more options. No matter which you choose, make sure to remove any paint so you get good metal-to-metal contact.
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Old 04-29-2014, 11:28 PM   #12
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Ended up using on of the cargo tie downs. Thanks for the help it works great.
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Old 04-30-2014, 01:13 AM   #13
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I pulled back the trim that is just rear of the door when it is closed, I guess that would be the B pillar. about 3/4 of the way down there are a few bolts that make great grounds and you can hide all of your wires pretty well.
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Old 04-30-2014, 06:05 AM   #14
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Quote:
Originally Posted by RFC89747 View Post
Ended up using on of the cargo tie downs. Thanks for the help it works great.
Glad to hear it.

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