Electrical plugs on firewall... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

soupcan · 07-10-2002, 10:53 AM

Hello All--
I'm trying to track down a short in the electrical system of my '72 truck. I was looking at what appear to be plugs where the wires go through the firewall near the power brake booster. I tugged on them a little but they didn't budge. Are these really plugs? Do they unplug from outside or inside the cab or both?? I've heard that you guys replace entire cabs, so I assume that something must disconnect somewhere!!

Thanks in advance...

*Randy70C-10* · 07-10-2002, 11:01 AM

That square thing that the wires go through IS a plug. If you take the center bolt out, the plug will come out.

Low69CST · 07-10-2002, 12:15 PM

I think your talking about the tail light plugs. I can't remember if they come out from the inside or outside. There are a couple other cables that run out of the cab around there, make sure its not one of those.

**Classic Heartbeat** · 07-10-2002, 01:00 PM

Witch wires are you talking about? The main harnesses that behind the fuse panel? If so you have to unscrew the 3/8" screw that holds the two plugs in. Then you can seperate the two by sliding them apart. The other harness that is close to the firewall is the taillight harness and the part that unplugs is actually on the interior side of the firewall. You can unplug it from the engine side but molded to the harness itself is the grommet that protects the harness. You can work that grommet out by wiggling it around and it will come out. WES www.ClassicHeartbeat.com

soupcan · 07-10-2002, 02:06 PM

Thanks! It is the main harness behind the fusebox, and now that I've peeled back the crust and wires, I see the screw holding me up! Thanks!

07-10-2002, 10:53 AM	#1
soupcan Registered User Join Date: Apr 2002 Location: Canton, TX USA Posts: 30	Electrical plugs on firewall... Hello All-- I'm trying to track down a short in the electrical system of my '72 truck. I was looking at what appear to be plugs where the wires go through the firewall near the power brake booster. I tugged on them a little but they didn't budge. Are these really plugs? Do they unplug from outside or inside the cab or both?? I've heard that you guys replace entire cabs, so I assume that something must disconnect somewhere!! Thanks in advance...

07-10-2002, 12:15 PM	#3
Low69CST Registered User Join Date: May 2000 Location: Frankfort, Kentucky, USA Posts: 2,163	I think your talking about the tail light plugs. I can't remember if they come out from the inside or outside. There are a couple other cables that run out of the cab around there, make sure its not one of those. __________________ '69 CST Short fleetside Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress) '87 V10 4x4 Short Fleetside Quad Suspension and Dual Tanks

07-10-2002, 01:00 PM	#4
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Witch wires are you talking about? The main harnesses that behind the fuse panel? If so you have to unscrew the 3/8" screw that holds the two plugs in. Then you can seperate the two by sliding them apart. The other harness that is close to the firewall is the taillight harness and the part that unplugs is actually on the interior side of the firewall. You can unplug it from the engine side but molded to the harness itself is the grommet that protects the harness. You can work that grommet out by wiggling it around and it will come out. WES www.ClassicHeartbeat.com __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

07-10-2002, 11:01 AM	#2
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	That square thing that the wires go through IS a plug. If you take the center bolt out, the plug will come out.

07-10-2002, 02:06 PM	#5
soupcan Registered User Join Date: Apr 2002 Location: Canton, TX USA Posts: 30	Thanks! It is the main harness behind the fusebox, and now that I've peeled back the crust and wires, I see the screw holding me up! Thanks!



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