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Unread 08-23-2014, 07:43 PM   #1
danfrye
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1978 CJ7 
 
Join Date: Jul 2013
Posts: 33
Grounding after fiberglass tub install

Transferring everything to a new frame and had to purchase a fiberglass tub due to rust. Anyway, using the old wiring harness for under the dash and to the rear lights. Have everything plugged back in but there is obviously a ground problem. I'm using the old steal dashboard.

I'm wondering if it can be fixed by installing a ground from the main fuse box/wiring harness, plug assembly at the firewall, under the dash. I'm hoping I don't have to specifically ground every individual thing.

Thanks for any tips you can send my way

Dan
1978 CJ7 build

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Unread 08-23-2014, 09:09 PM   #2
jammer1
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Run the ground directly from the battery. I put a junction block on the side of the tub under the dash. Two grounds from the battery, one directly to the dash, the other to the junction block. Any additional grounds I need can be connected to the junction block. Once you have the dash grounded, anything touching the dash that would normally use the dash for a ground should be grounded. Make sure the gauges and lights have a good ground. I've heard that you can burn out the gauges if they don't have a good ground. For the rear lights I drilled and tapped a hole in the frame and installed a bolt. From this I ran the grounds. Make sure you use a thick gauge wire from the battery to the dash and also to the junction block.
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Unread 08-23-2014, 11:39 PM   #3
hutch1200
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That's 100% the way I did it. Glass tub, steel dash, glass nose.
http://www.grainger.com/product/QUIC...AS01?$smthumb$
.
http://www.bizrate.com/belden-sc13b1...026832401/shop
All "long term borrowed" from Verizon truck. These all come in different lengths
Don't forget a Buss Bar on the cowl. http://www.delcity.net/store/Stud!Ty...Blocks/p_73275 Try to find one w/an enclosed lid.
Good luck
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Last edited by hutch1200; 08-23-2014 at 11:50 PM..
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Unread 08-24-2014, 04:26 AM   #4
Mike Romain
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Don't forget all the light fixtures need a ground to their cases for the signals to work. The ground that is there is only for the running lights. I originally ran an extra wire in each loom piece to pick these up, but now have a Centech harness that came with the extra ground wires. My wiper motor also didn't much like using the hinges for a ground so I ran a dedicated one to one of its mounting bolts.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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Unread 08-24-2014, 03:41 PM   #5
danfrye
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Okay... Besides running a wire from the ground of battery directly to the steal dash, you put in a ground junction box under the dash too? That's something that has multiple screw in points to run ground wires under the dash as needed... Right?
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Unread 08-24-2014, 03:54 PM   #6
jammer1
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Correct, as you add on to the jeep, you now have a good ground to run to. I forgot to mention I also ran one to the drivers side fender for future projects. This is a kit, I made my own up (cheaper and more heavy duty). But this gives you the idea http://www.painlesswiring.com/webcat...v.php?sl=40026
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Unread 08-24-2014, 09:13 PM   #7
danfrye
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Got it. Makes total sense now. Really appreciate the help.
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