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Old 11-29-2010, 11:00 PM   #1
k5hart
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Under dash wiring help

Could someone help me understand what these wires should be doing??



I believe the Red is going to the cig lighter, the Orange is going to the blower motor relay, and the grey is for lighting somewhere? Is something supposed to be plugged in a the fuse panel?

This is on a 1972 blazer with A/C.

Thanks!
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Old 11-29-2010, 11:59 PM   #2
ls1nova71
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Re: Under dash wiring help

The red wire for the cigarette lighter plugs into the fuse box in a spot labled "cig", the gray wire is for the lights in the heater controls and the extra plug coming off of it would be used for the light in the shift indicator if you had a tilt column, it plugs in a spot on the fuse box labled "clstr feed". The orange wire for the blower motor I believe plugs in the "ign unfused" spot, but I'd have to look at my truck to be positive.
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Old 11-30-2010, 08:26 AM   #3
k5hart
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Re: Under dash wiring help

Thanks lsnova71. I thought that was the case on all but the Orange wire. The connector on the orange wire isn't designed to plug into the fuse panel. It can however plug into one of the connectors on the red wire. This is my biggest question actually. I'm trying to fix my hign fan speed and I am not getting power at the orange wire. Just wanted to make sure I'm right before plugging wires in randomly. If this is right my next problem will be fixing my cig lighter feed on the fuse panel. PO has burned the connector up.
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Old 11-30-2010, 09:35 AM   #4
TobyArnot
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Re: Under dash wiring help

If that orange wire is paired with a white wire, it's likely for the dome light.

Last edited by TobyArnot; 11-30-2010 at 09:35 AM.
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Old 11-30-2010, 09:40 AM   #5
70cst
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Re: Under dash wiring help

You all are good!!!
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Old 11-30-2010, 09:47 AM   #6
KEL
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Re: Under dash wiring help

Quote:
Originally Posted by k5hart View Post
Thanks lsnova71. I thought that was the case on all but the Orange wire. The connector on the orange wire isn't designed to plug into the fuse panel. It can however plug into one of the connectors on the red wire. This is my biggest question actually. I'm trying to fix my hign fan speed and I am not getting power at the orange wire. Just wanted to make sure I'm right before plugging wires in randomly. If this is right my next problem will be fixing my cig lighter feed on the fuse panel. PO has burned the connector up.
your picture looks exactly like under my dash, and I've wondered the same things. Also, I have no high speed on my fan either ! When you get it all
sorted out, will you let me know ?
Thanks
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Old 12-01-2010, 09:32 AM   #7
k5hart
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Re: Under dash wiring help

Orange wire is definetly going over to the blower motor relay. I don't think it's the dome wire. The grey wire may be though. I am still a little confused on what's supposed to be. The Red wire is definetly going to the cigarette lighter and the orange connector fits right into one of the red connectors. Would they have pulled power for the high speed blower from the cigarette lighter?? Seems weird to me but possible I guess.

Anyone with an original truck out there that could check this? I've been going through the assembly manual but not getting a lot of clarification there.
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Old 12-01-2010, 12:44 PM   #8
k5hart
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Re: Under dash wiring help

Based on this post I think my idea is correct. The Orange plugs into the second jumper off the Red wire which plugs into the Cig port on the fuse panel. Funny how I've missed that on the diagram everytime I looked at it. I think I didn't believe it.

http://67-72chevytrucks.com/vboard/s...ghlight=blower

I'll have to figure out how to try this out. I wish my Cig connector wasn't burned off. I'll start a new post asking how to fix that I guess.
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