Tangled hacked mess of fire wire. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ah_5500 · 04-04-2017, 08:18 PM

My underdash harness has seen better days so I'm looking at purchasing a new one from:
-Classic parts / under $400
-Gmcpauls / under $400
-American auto / under $500
I want to use the factory firewall plug which is already new on the motor side and am not sure if I want old glass fuses or newer plastic ones.
I'm looking for insight from some first hand experience through you guys.
With all of the wiring harness out there, which do you guys run and which do you not? And why?
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OARNGESI · 04-04-2017, 08:55 PM

Go aaw you won't be sorry and you want me style fuses

87Skier · 04-04-2017, 10:05 PM

I would recommend putting in headlight relays (if your new harness doesn't include them). There is a lot of additional current on the system from this.

I ended up using my stock harness and haven't had any issues, I know this doesn't work for you as yours has been hacked. You could get a good used harness though.

For aftermarket stuff, I would go with blade style fuses. It reduces the size of the box, they are easier to pull and a lot more common these days.

tjsblazer · 04-06-2017, 12:29 AM

The blade style fuses come in the upgrade series from AAW. That uses a '68+ firewall plug layout size which requires the square firewall opening to be slightly enlarged and the two screw hole locations changed. It isn't hard. It could be done with a dremel cut off wheel. (your blazer is based on a '67 designed truck). I don't know if you can get an exact factory box duplicate with blade style fuses or only with original glass style.

I also don't know if the Engine side plug is a direct fit because I changed all my wiring at the same time. A quick call to AAW would answer that question.

tim's68gmc · 04-06-2017, 10:03 AM

I used AAW on my son's 68 GMC 3/4ton and now I am doing my 72 GMC Jimmy with AAW very easy to follow instructions.

ah_5500 · 04-06-2017, 09:26 PM

Thanks for the insight guys. How come you chose aaw over other brands?
Posted via Mobile Device

robs71k5 · 04-08-2017, 08:36 PM

I have an underdash harness with good wires but the fuse block corner is broken off and missing.

04-04-2017, 08:18 PM	#1
ah_5500 Registered User Join Date: Nov 2008 Location: knoxville, tn Posts: 155	Tangled hacked mess of fire wire. My underdash harness has seen better days so I'm looking at purchasing a new one from: -Classic parts / under $400 -Gmcpauls / under $400 -American auto / under $500 I want to use the factory firewall plug which is already new on the motor side and am not sure if I want old glass fuses or newer plastic ones. I'm looking for insight from some first hand experience through you guys. With all of the wiring harness out there, which do you guys run and which do you not? And why? Posted via Mobile Device

04-04-2017, 08:55 PM	#2
OARNGESI Registered User Join Date: Sep 2008 Location: CASA GRANDE AZ Posts: 4,276	Re: Tangled hacked mess of fire wire. Go aaw you won't be sorry and you want me style fuses __________________ 70 SWB STEPSIDE 70 BLAZER 09 challenger

04-04-2017, 10:05 PM	#3
87Skier Registered User Join Date: Mar 2014 Location: Corvallis, OR Posts: 715	Re: Tangled hacked mess of fire wire. I would recommend putting in headlight relays (if your new harness doesn't include them). There is a lot of additional current on the system from this. I ended up using my stock harness and haven't had any issues, I know this doesn't work for you as yours has been hacked. You could get a good used harness though. For aftermarket stuff, I would go with blade style fuses. It reduces the size of the box, they are easier to pull and a lot more common these days. __________________ 1972 GMC Jimmy Custom 4.8L (L20)/6L90E/NP205 1989 Chevy Suburban V2500 350/Turbo 400/4.11 gears 1996 Chevy Suburban K1500 350/4L60E

04-06-2017, 12:29 AM	#4
tjsblazer Registered User Join Date: Oct 2009 Location: Great White North Posts: 1,520	Re: Tangled hacked mess of fire wire. The blade style fuses come in the upgrade series from AAW. That uses a '68+ firewall plug layout size which requires the square firewall opening to be slightly enlarged and the two screw hole locations changed. It isn't hard. It could be done with a dremel cut off wheel. (your blazer is based on a '67 designed truck). I don't know if you can get an exact factory box duplicate with blade style fuses or only with original glass style. I also don't know if the Engine side plug is a direct fit because I changed all my wiring at the same time. A quick call to AAW would answer that question. __________________ Jeff. '72 Blazer K5 "Camshaft opinions are like belly buttons; everyone has one and no two are alike" My Blazer Build: http://67-72chevytrucks.com/vboard/s...d.php?t=626752 My Engine Build: http://67-72chevytrucks.com/vboard/s...d.php?t=637336

04-06-2017, 10:03 AM	#5
tim's68gmc Registered User Join Date: Jan 2015 Location: tacoma Posts: 247	Re: Tangled hacked mess of fire wire. I used AAW on my son's 68 GMC 3/4ton and now I am doing my 72 GMC Jimmy with AAW very easy to follow instructions. __________________ vehicle's I own 1968 gmc 3/4 ton camper special 1972 gmc jimmy 1972 Chevrolet nova 1947 ford 1.5 ton dully 1997 f-350 1 ton 2007 Chrysler 300 with hemi

04-06-2017, 09:26 PM	#6
ah_5500 Registered User Join Date: Nov 2008 Location: knoxville, tn Posts: 155	Re: Tangled hacked mess of fire wire. Thanks for the insight guys. How come you chose aaw over other brands? Posted via Mobile Device

04-08-2017, 08:36 PM	#7
robs71k5 K5drive Join Date: Nov 2004 Location: burnaby BC Canada Posts: 815	Re: Tangled hacked mess of fire wire. I have an underdash harness with good wires but the fuse block corner is broken off and missing.



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