A/C blower relay wire question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BigRed76 · 01-17-2016, 08:33 PM

Ever since I got my GMC the positive wire (orange) for the blower relay has been disconnected (due to being cut), and I want to reconnect it to the fuse box but I'm unsure of which terminal in the fuse box it plugs in to. There are only two fused terminals, one 15 amp and one 20 amp, but the 20 amp is for the radio which will be used in the near future. It doesn't seem wise to connect it to one of the unfused terminals either. Any info is greatly appreciated, Thanks

Ugly 61 · 01-18-2016, 01:33 PM

I have the orange wire on the blower relay on my 72 GMC plugged into the bottom ign unfused spade where you have the red and white wires.I've never had any problems, however if you are worried your stub wire looks just the right length to wire in a 30 amp inline fuse.
Ugly 61

davepl · 01-18-2016, 03:44 PM

IGN UNFUSED

If your wire is too short now's a good time to make a Y-cable with packard connectors (the style of everything original to the truck) so you can plug multiple things into the IGN UNFUSED anyway. Just make one end long enough to comfortably reach the orange.

If you're not picky about era-correct connectors, you can do it with crimp connectors too of course.

BigRed76 · 01-18-2016, 03:47 PM

Thanks guys. This is the only a/c truck I've had so I wasn't sure. I think I'll go ahead and put in an inline fuse and use the ign infused.

**VetteVet** · 01-18-2016, 05:50 PM

check the diagrams in some of these threads and you will notice that the orange wire to the relay is plugged into the CIG terminal on the fuse panel.

https://www.google.com/search?domain...D%3A1%3B&hl=en

It is just a power point for the orange wire so the other options listed in the other posts will work as well. I believe the CIG terminal is full time hot and the others may be key on hot but it does not matter because the AC relay is cold until the relay is energized.

hdff · 01-23-2016, 12:13 PM

I had the same problem, the orange wire was not hooked up and a red wire was plugged into the cig terminal. I unplugged the red and there was a place on the orange wire to plug it in to and then plugged the orange wire into the cig terminal. Haven't finished the AC install yet so I'm hoping this is gonna work. Thanks for the info and wire diagram on my thread Vettevet

**JimH2828** · 01-23-2016, 01:20 PM

Recently I got my blower back up and running for heat. I read a few posts that said the orange (12 gauge) blower relay wire plugs into the red cigarette lighter wire harness extra socket. Things are working well for me.

Name: Fuse Panel 01_23_16 (5).jpg
Views: 567
Size: 99.0 KB

Name: Fuse Panel 01_23_16 (5).jpg
Views: 567
Size: 99.0 KB

-Jim

BigRed76 · 01-31-2016, 10:55 PM

I wired it this weekend, ended up connecting it to the top ign. unfused terminal on the right side of the fuse box with an inline 30 amp fuse. Works great, thanks for your help guys

OhioPaul · 12-24-2018, 09:36 AM

Does anyone else have a purple wire running to their blower motor? Mine is Purple and looks completely from the factory. It's tied into the ac plug w/ drk grn and blk.

I have one smaller orange wire coming out of the firewall near the coil that runs to a plug in the cab (not connected to anything) w/ a pink wire.

None of the wiring diagrams I've found match up to my wiring.

01-17-2016, 08:33 PM	#1
BigRed76 Registered User Join Date: Jan 2010 Location: Loveland, CO Posts: 1,921	A/C blower relay wire question Ever since I got my GMC the positive wire (orange) for the blower relay has been disconnected (due to being cut), and I want to reconnect it to the fuse box but I'm unsure of which terminal in the fuse box it plugs in to. There are only two fused terminals, one 15 amp and one 20 amp, but the 20 amp is for the radio which will be used in the near future. It doesn't seem wise to connect it to one of the unfused terminals either. Any info is greatly appreciated, Thanks Attached Images __________________ Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB

01-18-2016, 01:33 PM	#2
Ugly 61 Registered User Join Date: Jan 2015 Location: Clyde KS Posts: 91	Re: A/C blower relay wire question I have the orange wire on the blower relay on my 72 GMC plugged into the bottom ign unfused spade where you have the red and white wires.I've never had any problems, however if you are worried your stub wire looks just the right length to wire in a 30 amp inline fuse. Ugly 61

01-18-2016, 03:44 PM	#3
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Re: A/C blower relay wire question IGN UNFUSED If your wire is too short now's a good time to make a Y-cable with packard connectors (the style of everything original to the truck) so you can plug multiple things into the IGN UNFUSED anyway. Just make one end long enough to comfortably reach the orange. If you're not picky about era-correct connectors, you can do it with crimp connectors too of course. __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

01-18-2016, 03:47 PM	#4
BigRed76 Registered User Join Date: Jan 2010 Location: Loveland, CO Posts: 1,921	Re: A/C blower relay wire question Thanks guys. This is the only a/c truck I've had so I wasn't sure. I think I'll go ahead and put in an inline fuse and use the ign infused. __________________ Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB

01-18-2016, 05:50 PM	#5
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,719	Re: A/C blower relay wire question check the diagrams in some of these threads and you will notice that the orange wire to the relay is plugged into the CIG terminal on the fuse panel. https://www.google.com/search?domain...D%3A1%3B&hl=en It is just a power point for the orange wire so the other options listed in the other posts will work as well. I believe the CIG terminal is full time hot and the others may be key on hot but it does not matter because the AC relay is cold until the relay is energized. __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. Last edited by VetteVet; 01-18-2016 at 06:03 PM.

01-23-2016, 12:13 PM	#6
hdff Registered User Join Date: Apr 2007 Location: pasadena,TEXAS Posts: 880	Re: A/C blower relay wire question I had the same problem, the orange wire was not hooked up and a red wire was plugged into the cig terminal. I unplugged the red and there was a place on the orange wire to plug it in to and then plugged the orange wire into the cig terminal. Haven't finished the AC install yet so I'm hoping this is gonna work. Thanks for the info and wire diagram on my thread Vettevet Attached Images __________________ 1971 Cheyenne SWB 402BB, 700R4, 3.73 posi, PS, PB, A/C, Tilt, Tach "Wanda" Don't argue with idiots, People watching may not be able to tell the difference... There's someone in my head........But it's not me...... cheap tricks thread great info here!! http://67-72chevytrucks.com/vboard/s...d.php?t=489394

01-23-2016, 01:20 PM	#7
JimH2828 Senior Member Join Date: Oct 2012 Location: Cumming GA Posts: 621	Re: A/C blower relay wire question Recently I got my blower back up and running for heat. I read a few posts that said the orange (12 gauge) blower relay wire plugs into the red cigarette lighter wire harness extra socket. Things are working well for me. -Jim

01-31-2016, 10:55 PM	#8
BigRed76 Registered User Join Date: Jan 2010 Location: Loveland, CO Posts: 1,921	Re: A/C blower relay wire question I wired it this weekend, ended up connecting it to the top ign. unfused terminal on the right side of the fuse box with an inline 30 amp fuse. Works great, thanks for your help guys __________________ Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB

12-24-2018, 09:36 AM	#9
OhioPaul Registered User Join Date: Oct 2018 Location: Malvern Ohio Posts: 31	Re: A/C blower relay wire question Does anyone else have a purple wire running to their blower motor? Mine is Purple and looks completely from the factory. It's tied into the ac plug w/ drk grn and blk. I have one smaller orange wire coming out of the firewall near the coil that runs to a plug in the cab (not connected to anything) w/ a pink wire. None of the wiring diagrams I've found match up to my wiring.



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