Weird grounding block bolted to firewall - Chevelle Tech
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post #1 of 38 (permalink) Old May 6th, 14, 8:38 PM Thread Starter
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Weird grounding block bolted to firewall

Trying to clean up the eyesore that is bolted to my firewall...Anyway to relocate this to stock location? Also, there are two wires, a green and a brown that are bolted to it and run to the front near the horns but are cut and don't attach to anything. Any idea what they were for? both horns stiff have their wiring. Any advice would be greatly appreciated!
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post #2 of 38 (permalink) Old May 6th, 14, 8:48 PM
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Re: Weird grounding block bolted to firewall

There is no stock location because thatís FAR from factoryÖyikes. What year car?

If you donít push the limits how are you going to find the weak spots?
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post #3 of 38 (permalink) Old May 6th, 14, 8:58 PM Thread Starter
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Re: Weird grounding block bolted to firewall

Yeah..I was afraid of that...1967 Elco
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post #4 of 38 (permalink) Old May 6th, 14, 9:02 PM Thread Starter
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Re: Weird grounding block bolted to firewall

probably best to just start over with a new harness at this point huh?
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post #5 of 38 (permalink) Old May 6th, 14, 9:34 PM
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Re: Weird grounding block bolted to firewall

Well, there's not that many wires there. I would trace them to each end, figure out if they're needed. The one's that are needed, put a decent splice on and some clean routing and put inside some sort of sleeve/wrap. Get rid of that junction block, I don't really know what purpose it serves.
And get a grommet in there too.
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post #6 of 38 (permalink) Old May 6th, 14, 9:49 PM
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Re: Weird grounding block bolted to firewall

Wow, looks like a repurposed telephone demarcation point wiring assembly.

See my response in your courtesy light post, new harnesses are looking like the way to go...

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post #7 of 38 (permalink) Old May 6th, 14, 10:13 PM Thread Starter
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Re: Weird grounding block bolted to firewall

Ok, so after I remove the unnecessary wires and remove the block, how/where do I ground whats left? And yes Coppertop, a rewire is definitely needed in the nearish future but for now, seeing as how most everything works and there are other things to get done, I am going to limp this harness along a bit longer. What seems to most recommended harness around here?
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post #8 of 38 (permalink) Old May 6th, 14, 11:59 PM
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Re: Weird grounding block bolted to firewall

I don't think that block has anything to do with ground. I might be wrong as I'm not familiar with it.
Find out where or what the large green and brown wires did. If nothing, get them outta the way.
Next the big red wire...where does it start and stop? Untape as necessary. Remove the two eyelets and do a butt splice.
The one on far left. It doesn't look like it leaves the block. Trace to see where it comes from. Needed? If not, delete.
Same for two in the center. Needed?
I might be wrong on this but it looks like a simple junction block but I have no idea what its purpose would be.
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post #9 of 38 (permalink) Old May 7th, 14, 7:15 AM
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Re: Weird grounding block bolted to firewall

Looks like the red wire goes inside the car. Possible to another distribution block that ends up powering something else.

Does the orange wire go to the starter?
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post #10 of 38 (permalink) Old May 7th, 14, 7:55 AM
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Re: Weird grounding block bolted to firewall

Bikepro
I'm not sure from that first pic if that's fusilli or linguine. but at the very least a new engine harness is easy enough to install. before you order engine harness figure out any upgrades. ie. one wire alt, msd, internal regulator. american auto wire configured my engine harness & everything was spot on !
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post #11 of 38 (permalink) Old May 7th, 14, 8:47 AM
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Re: Weird grounding block bolted to firewall

That's an old terminal strip. Apparently someone in the past did some electrical mod or repair of the existing harness. I would trace each wire to it's destination to figure out what is going on before removing or modifying it. It is isolated from ground or power as each lug is a separate circuit.

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post #12 of 38 (permalink) Old May 7th, 14, 7:38 PM
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Re: Weird grounding block bolted to firewall

Quote:
Originally Posted by Bikebro View Post
What seems to most recommended harness around here?
American Autowire hands-down. They make plug-n-play exact reproduction harnesses, they can modify an otherwise "stock" harness for modern goodies like HEI ignition or internally regulated alternator, or if you want to modernize more, they offer a classic update system that brings newer style fuses, circuits and layouts to your vehicle.

You just have to decide what you want to do in the grand scheme of things when you get to that point.

M&H wiring harness offer similar products, but American Autowire has a representative (Donny) that post here as an added bonus if you run into a snag.

Painless Wiring products is great for resto-mod projects, but they are not for the beginner due to the fact you have to cut, splice and crimp in order to re-use factory connectors for certain items and understand ultimately how the factory circuits worked in order to interface the new wiring properly.

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post #13 of 38 (permalink) Old May 7th, 14, 10:14 PM Thread Starter
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Re: Weird grounding block bolted to firewall

Quote:
Originally Posted by Coppertop View Post
American Autowire hands-down. They make plug-n-play exact reproduction harnesses, they can modify an otherwise "stock" harness for modern goodies like HEI ignition or internally regulated alternator, or if you want to modernize more, they offer a classic update system that brings newer style fuses, circuits and layouts to your vehicle.

You just have to decide what you want to do in the grand scheme of things when you get to that point.

M&H wiring harness offer similar products, but American Autowire has a representative (Donny) that post here as an added bonus if you run into a snag.

Painless Wiring products is great for resto-mod projects, but they are not for the beginner due to the fact you have to cut, splice and crimp in order to re-use factory connectors for certain items and understand ultimately how the factory circuits worked in order to interface the new wiring properly.
Thanks for the info! Looks like I will go with American Autowire sometime down the road!
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post #14 of 38 (permalink) Old May 7th, 14, 10:28 PM Thread Starter
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Re: Weird grounding block bolted to firewall

Ok so I chased some wires down today, 4 of them appear to be for the aftermarket water/temp/amp gauges under my heater control (Green and brown from block to front of car and red and yellow from block to gauges) Please examine photos below to get an idea how they are hooked up. So as you can see the green and brown wires are not hooked up to anything at the front of the car, how do I get power to these? I am thinking that if I splice the brown and red together and the green and yellow together and shorten the wire run I could install the stock rubber cover and it would look fine. Is there a better way to do it? Also, is the hole under the block OEM or did someone put that there? How Do I run the wires into the cab if that hole is a DIY job and I fill it in?

Sorry for the long winded series of questions but any help would be greatly appreciated!
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post #15 of 38 (permalink) Old May 7th, 14, 10:33 PM Thread Starter
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Re: Weird grounding block bolted to firewall

Also, the other two red wires that run into the hole below the block seem to go to the ignition so im not sure what to do about those anymore haha.
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