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02-26-2019, 01:09 PM
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#1 |
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Registered User
Join Date: Sep 2013
Location: North Tonawanda, NY
Posts: 236
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1972 Engine Electrical
Ref attached photos. So I am curious where to attach the red coiled 12 gage wire coming from the brake master cylinder area of the engine bay in the attached photo. It has a connector block like the block already attached to passenger fender by the battery - see next photo.
I recently bought this truck and have a few things to sort out. Any help appreciated. Thanks! |
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02-26-2019, 02:27 PM
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#2 |
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Registered User
Join Date: Apr 2008
Location: Md
Posts: 2,461
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Re: 1972 Engine Electrical
Long red wire goes just on top of radiator in plastic pinch all the way across to alternator, on drivers side. Check in electrical section for schematic.
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http://67-72chevytrucks.com/vboard/s...d.php?t=635605 |
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02-26-2019, 04:56 PM
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#3 |
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The Older Generation
   
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,407
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Re: 1972 Engine Electrical
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That junction block is something someone has added. It is not stock. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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02-26-2019, 05:15 PM
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#4 |
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Registered User
Join Date: Oct 2011
Location: Victoria, B.C
Posts: 3,794
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Re: 1972 Engine Electrical
As already stated...that second junction block with the nest of red wires is not stock.
It looks like someone has been working their way towards trying to run a new (full) 12 volt line to the ignition and then to the coil to the replace the stock/original lower voltage wire. What type of distributor/ignition is in the truck? ie: stock (points?) with a separate coil?....or an HEI ignition? All good Coley
__________________
....for some men, there is experience, skill and effort....for the others...there is visa and UPS LOL 1966 Chevy 1/2 ton (Florida- Red/white) 1972 Chevy 1/2 ton (California- Blue/white) 2005 Chevy Silverado HD2500/Duramax 2000 Dodge Ram 1500 |
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02-26-2019, 06:44 PM
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#5 |
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Msgt USAF Ret
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,709
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Re: 1972 Engine Electrical
Did you have an auxiliary battery in the truck I.E. camper special that might have used these wires and junction? They are usually hot so check for voltage before connecting them to anything.
Like was said they are probably an additional power source for some device.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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02-26-2019, 07:22 PM
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#6 |
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Registered User
Join Date: Sep 2013
Location: North Tonawanda, NY
Posts: 236
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Re: 1972 Engine Electrical
Truck has options Z62 Custom Deluxe Equipment and UY1 Camper Wiring and there is no auxiliary battery so I bet it has something to do with the camper wiring option.
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02-27-2019, 03:59 AM
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#7 |
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Registered User
Join Date: Jan 2007
Location: Puyallup, WA
Posts: 1,660
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Re: 1972 Engine Electrical
A fusible link needs to be connected to the junction block as well. Don't remember off the top of my head what size tho.
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72 C10 lwb fleetside -stock 350/350 combo |
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02-27-2019, 04:00 AM
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#8 |
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Registered User
Join Date: Jan 2007
Location: Puyallup, WA
Posts: 1,660
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Re: 1972 Engine Electrical
Here's an old thread that covers it pretty well. http://67-72chevytrucks.com/vboard/s...d.php?t=545962
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72 C10 lwb fleetside -stock 350/350 combo |
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02-27-2019, 04:05 AM
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#9 | |
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Registered User
Join Date: Jul 2015
Location: 2nd left past the stump on a dirt road.
Posts: 2,629
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Re: 1972 Engine Electrical
Quote:
The wiring schematics will show you everything for the most part, 99%, the rest is added on or changed for modified HEI or other accessories. |
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