Vague Electrical Question on a 64 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

blackmopar · 03-12-2010, 05:10 PM

I warned ya! haha

Alright - the PO did some interesting 'repairs' on the engine compartment wiring harnesses and I am in the process of rewiring it.

Im having a hard time identifying function of one of the wires. I think it was for the factory 'amp' guage?? Its the Black/White Stripe (14 or 16awg) wire at the drivers side firewall bulkhead. It runs to the horn relay and is spliced in with the 12awg red.

Am I right that it is the Amp Gauge wire?

I am planning to use a later model alt with built in voltage reg, so I am eliminating the VR box near the horn relay and will also wire in a volt gauge instead of the AMp gauge, so if I am id'ing this black wire correctly, it can be eliminated. Right?

thanks if anyone held in for that dissertation and actually understands what Im asking.

Sean

blackmopar · 03-12-2010, 05:14 PM

ok, I beleive this schematic confirms question - but figure Ill leave it all up here for comment and maybe help someone else as clueless as I.

62gmc910 · 03-12-2010, 05:35 PM

If you go with an alternator that charges more than 37 amps hook a 10 guage wire directly to the battery , the stock system was only designed for 37 amps not 60 or 80 that most of the internal regulators make.

blackmopar · 03-12-2010, 05:39 PM

thanks 62 - Im all good with that - Im actually rewiring majority of underhood to Mad Electricals 'New System' for GMC - it definitly takes this into consideration.

I just wanted to make sure I was identifying that black/white wire correctly - and for some reason I didnt have or misplaced that 'old chevy' diagram with my stuff from MAD - found with a google search after I posted.

Hilandr451 · 03-13-2010, 01:40 PM

That black & white wire does go to the ammeter and by the looks of your "wiring diagram" you've got posted the wiring shown will work for stock equipment. The factory wiring landed the other wire to the "batt" terminal at the starter. Your diagram isn't clear where that termination is, but it is correct schematically. What ever you do don't connect that return wire to ground!!

Here's what I had to deal with after the P.O. realised that a 1/4-20 bolt has the same diameter as a fuse.......

I kept the "fused" section of my old harness as a shop souvenir

03-12-2010, 05:10 PM	#1
blackmopar Registered User Join Date: Jul 2009 Location: fallbrook, ca Posts: 326	Vague Electrical Question on a 64 I warned ya! haha Alright - the PO did some interesting 'repairs' on the engine compartment wiring harnesses and I am in the process of rewiring it. Im having a hard time identifying function of one of the wires. I think it was for the factory 'amp' guage?? Its the Black/White Stripe (14 or 16awg) wire at the drivers side firewall bulkhead. It runs to the horn relay and is spliced in with the 12awg red. Am I right that it is the Amp Gauge wire? I am planning to use a later model alt with built in voltage reg, so I am eliminating the VR box near the horn relay and will also wire in a volt gauge instead of the AMp gauge, so if I am id'ing this black wire correctly, it can be eliminated. Right? thanks if anyone held in for that dissertation and actually understands what Im asking. Sean

03-12-2010, 05:14 PM	#2
blackmopar Registered User Join Date: Jul 2009 Location: fallbrook, ca Posts: 326	Re: Vague Electrical Question on a 64 ok, I beleive this schematic confirms question - but figure Ill leave it all up here for comment and maybe help someone else as clueless as I. Attached Images

03-12-2010, 05:35 PM	#3
62gmc910 Registered User Join Date: Nov 2009 Location: Cremona AB Canada Posts: 370	Re: Vague Electrical Question on a 64 If you go with an alternator that charges more than 37 amps hook a 10 guage wire directly to the battery , the stock system was only designed for 37 amps not 60 or 80 that most of the internal regulators make. __________________ 62 GMC 910 short fleetside 454 super t10 14 bolt w/gov lock 70s c20 front discs (built in the 80s) 65 GMC 930 dualwheel 292 4spd all origonal 39k mi(my sons truck) 63 GMC 950 camperized school bus, (Gus the bus) 350 4speed 2 speed rear 64 GMC 950 "spare" bus 283? 4speed detroit locker 53 GMC 1ton dual wheel bus 78 GMC c25 short course off road race truck(son's truck) 355 th400 14 bolt (www.wheel2wheel.ca) 88 Peterbilt 379 longhood (hauls race truck)

03-12-2010, 05:39 PM	#4
blackmopar Registered User Join Date: Jul 2009 Location: fallbrook, ca Posts: 326	Re: Vague Electrical Question on a 64 thanks 62 - Im all good with that - Im actually rewiring majority of underhood to Mad Electricals 'New System' for GMC - it definitly takes this into consideration. I just wanted to make sure I was identifying that black/white wire correctly - and for some reason I didnt have or misplaced that 'old chevy' diagram with my stuff from MAD - found with a google search after I posted. Last edited by blackmopar; 03-12-2010 at 05:40 PM.

03-13-2010, 01:40 PM	#5
Hilandr451 Registered User Join Date: Oct 2005 Location: Houston Texas Posts: 316	Re: Vague Electrical Question on a 64 That black & white wire does go to the ammeter and by the looks of your "wiring diagram" you've got posted the wiring shown will work for stock equipment. The factory wiring landed the other wire to the "batt" terminal at the starter. Your diagram isn't clear where that termination is, but it is correct schematically. What ever you do don't connect that return wire to ground!! Here's what I had to deal with after the P.O. realised that a 1/4-20 bolt has the same diameter as a fuse....... I kept the "fused" section of my old harness as a shop souvenir __________________ Greg Smith a.k.a. "The Highlander" 1966 C20 Custom Camper, 2017 Chevy Silverado 1500 Highlander's Project Pics Highlander's web site: www.6066ChevyTrucks.com

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