MN WTB Dual Battery harness - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**tkeduk8r** · 11-29-2016, 05:52 PM

Could be a question for gmachines, but Im looking to upgrade my new to me 85 k2500 burb to a 12V dual Battery set up since, unfortunately, its a winter warrior. So didnt know if any of you guys knew a source, or had, a factory dual battery harness available. I allready have the aux. tray, so just need the harness. Thanks in advance!
--Mike

*gmachinz* · 11-29-2016, 06:37 PM

lol....you know I've got ya covered! PM me for details....for example: running an isolator? doing an alternator upgrade?

D13 · 11-30-2016, 08:07 AM

On my 87 Diesel the only 'dual' portion is the 4ga positive cable that runs from drivers battery across core support to passenger side battery, a starter cable end at the battery designed for the dual cable, and the 4ga ground from the drivers battery to the AC/PS bracket. Everything else is the same as a regular vehicle. The 85A alternator has a 10ga output wire, but wires just like a gasser.

*gmachinz* · 11-30-2016, 10:59 AM

Ok....let me put together a kit that will show you a better idea of what I offer-I recently built one for my own truck-pics are always better than words!!

jjzepplin · 11-30-2016, 11:33 AM

Subbed for pics.

86454k30 · 11-30-2016, 02:18 PM

Diesel and gas trucks are wired differently. The diesel trucks use both batteries to start which is why the cables run between each battery. The gas truck dual batteries are isolated from each other via a solenoid on the driver fender and get power from the distribution block behind the brake booster.

meatwagon83 · 11-30-2016, 11:06 PM

In for pics of said harness

**tkeduk8r** · 12-03-2016, 12:21 PM

Yeah I think in my application the diesel harness is the way to go... at -44 below I need both batteries with a carb

Mike

Pontiac1976 · 03-12-2017, 01:50 PM

Pic's harness's would be kool. Where this private pic's or just for got
to post here?

11-29-2016, 05:52 PM	#1
tkeduk8r Senior Member Join Date: Apr 2001 Location: Alexandria, MN Posts: 1,462	WTB Dual Battery harness Could be a question for gmachines, but Im looking to upgrade my new to me 85 k2500 burb to a 12V dual Battery set up since, unfortunately, its a winter warrior. So didnt know if any of you guys knew a source, or had, a factory dual battery harness available. I allready have the aux. tray, so just need the harness. Thanks in advance! --Mike __________________ 63 C20 2WD, 230/SM420/4.11 73K 68 C30 dump truck, 327,SM425,4.56 66K original 68 C10 2WD SWB Stepper, 250/3-tree/3.73 66K.... Wifes 68 Buick Skylark Custom Conv., 350/TH400/2.56 In our family since '79 69 GMC 1500 SWB 2WD, 350/TH350/3.73 posi... 70 K10 SWB 4X4 4-sp,ps, pb, tilt, buckets, console, sliding back window (Need AC parts) WIP 72 Chevy K20 4x4 350/350/205/4.56 donor 72 Vette 350/M21/3.70 posi, triple black and super fast 84 Olds Cutlass Brougham 350/2004r/4.11 was Dad's

11-29-2016, 06:37 PM	#2
gmachinz Account Suspended Join Date: Jun 2011 Location: Des Moines, IA. Posts: 4,143	Re: WTB Dual Battery harness lol....you know I've got ya covered! PM me for details....for example: running an isolator? doing an alternator upgrade?

11-30-2016, 08:07 AM	#3
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,851	Re: WTB Dual Battery harness On my 87 Diesel the only 'dual' portion is the 4ga positive cable that runs from drivers battery across core support to passenger side battery, a starter cable end at the battery designed for the dual cable, and the 4ga ground from the drivers battery to the AC/PS bracket. Everything else is the same as a regular vehicle. The 85A alternator has a 10ga output wire, but wires just like a gasser. __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors

11-30-2016, 10:59 AM	#4
gmachinz Account Suspended Join Date: Jun 2011 Location: Des Moines, IA. Posts: 4,143	Re: WTB Dual Battery harness Ok....let me put together a kit that will show you a better idea of what I offer-I recently built one for my own truck-pics are always better than words!!

11-30-2016, 11:33 AM	#5
jjzepplin Registered User Join Date: Feb 2012 Location: Ruskin Florida Posts: 4,566	Re: WTB Dual Battery harness Subbed for pics. __________________ 70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350

11-30-2016, 02:18 PM	#6
86454k30 Registered User Join Date: May 2008 Location: Spokane, Washington Posts: 596	Re: WTB Dual Battery harness Diesel and gas trucks are wired differently. The diesel trucks use both batteries to start which is why the cables run between each battery. The gas truck dual batteries are isolated from each other via a solenoid on the driver fender and get power from the distribution block behind the brake booster.

11-30-2016, 11:06 PM	#7
meatwagon83 Registered User Join Date: Dec 2012 Location: Preble county ohio Posts: 1,914	Re: WTB Dual Battery harness In for pics of said harness __________________ "DON'T TOUCH THE TRIM!!"-Early Kyler

12-03-2016, 12:21 PM	#8
tkeduk8r Senior Member Join Date: Apr 2001 Location: Alexandria, MN Posts: 1,462	Re: WTB Dual Battery harness Yeah I think in my application the diesel harness is the way to go... at -44 below I need both batteries with a carb Mike __________________ 63 C20 2WD, 230/SM420/4.11 73K 68 C30 dump truck, 327,SM425,4.56 66K original 68 C10 2WD SWB Stepper, 250/3-tree/3.73 66K.... Wifes 68 Buick Skylark Custom Conv., 350/TH400/2.56 In our family since '79 69 GMC 1500 SWB 2WD, 350/TH350/3.73 posi... 70 K10 SWB 4X4 4-sp,ps, pb, tilt, buckets, console, sliding back window (Need AC parts) WIP 72 Chevy K20 4x4 350/350/205/4.56 donor 72 Vette 350/M21/3.70 posi, triple black and super fast 84 Olds Cutlass Brougham 350/2004r/4.11 was Dad's

03-12-2017, 01:50 PM	#9
Pontiac1976 Registered User Join Date: Oct 2015 Location: Ottawa, Ontario, Canada Posts: 769	Re: WTB Dual Battery harness Pic's harness's would be kool. Where this private pic's or just for got to post here? __________________ 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change.



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