Weird grounding block bolted to firewall - Page 3 - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #31 of 38 (permalink) Old May 8th, 14, 9:54 PM
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Darren
 
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Re: Weird grounding block bolted to firewall

And, as mentioned before (donít do it yet) seal up all those gaping holes in the firewall and ISOLATE any wires running through the firewall with the correct sized grommet. This process takes forethought, as Joe said.. HAVE A PLANÖ getting a grommet in place when you are DONE is not fun, because to do it correctly, youíll have to redo it all.

If you donít push the limits how are you going to find the weak spots?
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post #32 of 38 (permalink) Old May 8th, 14, 10:24 PM Thread Starter
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Re: Weird grounding block bolted to firewall

Thanks for the advice 70, I am getting ready to do headers and engine/engine bay repaint so when I have everything sanded down I will have all the non OEM holes filled in with metal the right way before I paint.
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post #33 of 38 (permalink) Old May 8th, 14, 10:26 PM Thread Starter
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Re: Weird grounding block bolted to firewall

Any info on that wire that plugs into the distributor? What is its function?
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post #34 of 38 (permalink) Old May 8th, 14, 10:45 PM Thread Starter
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Re: Weird grounding block bolted to firewall

And volt gauges seem to be the way to go over amme. huh? I might as well just replace the whole cluster then. How can I remove the oil pressure line and block it off till I install new gauges? I dont want the thing pumping oil into the cab ...
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post #35 of 38 (permalink) Old May 9th, 14, 3:51 PM
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Re: Weird grounding block bolted to firewall

I had a similar spaghetti wiring issue on my 68'. I'd follow one red wire back and it would be spliced 5 different times, in all different colored wires, till it came to the correct wire color at the firewall. Awful what a hacked up wiring job can do. From there, it's a matter of following it to the fuse to see what the heck it's supposed to be for.

Take one wire at a time and follow it back to the fuse box or other origin. It helps to have the correct year / car wiring diagram to figure out where these wires are supposed to go. Once the basic wiring is done (lights, charging, etc.), move onto the aftermarket wiring. You may be able to find wiring diagrams for the aftermarket gauges at the manufacturer's website.

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post #36 of 38 (permalink) Old May 9th, 14, 7:27 PM
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Re: Weird grounding block bolted to firewall

Looking at your pictures you have an HEI distributor. There are two connections under the tab that sticks out--"BAT" and "TAC".

BAT is 12 volts input that is switched from the ignition switch. TAC is where the tachometer feed connects.

I would think it would be best to plug the oil sender at the engine. Remove the sender and install an electric sender, even if it is just to plug the hole. Don't try to cap the tube running into the passenger compartment.

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post #37 of 38 (permalink) Old May 9th, 14, 7:30 PM
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Re: Weird grounding block bolted to firewall

Quote:
Originally Posted by Bikebro View Post
Any info on that wire that plugs into the distributor? What is its function?
If you're talking about the one at your finger and thumb....I believe that would be your 12 volt ignition wire. See where it is hooked up under the dash. It should go to switched 12 volt power. Someone please correct me if I'm wrong. On my 69, there is a nice lug in the fuse box for it.
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post #38 of 38 (permalink) Old May 9th, 14, 7:35 PM
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Re: Weird grounding block bolted to firewall

Beat ya to it Todd

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