Electric Fan Conversion Question

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Dantheman-2003

Dantheman-2003

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The double wire ground on the 05+ trucks is a ring terminal attached to the factory side frame rail just above the passenger side frame horn/bumper bracket. It's difficult to see it unless you are specifically looking for it.
I attached mine in the same general area. I grounded it to the bolt that holds the horn to the passenger side frame. And you know that's a good ground because the horn is grounded through that same bolt.
Appreciate the feedback. I get that the ground or grounds are to be fastened to a grounding source such as the frame. My question is, going back the other direction, where is the ground starting point at fuse block? As I’ve mentioned, I have 1 black ground coming out of the fuse block and eventually makes its way to one of the fans. Are you saying tap this black ground and pigtail off to a grounding point?
 

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Rocket Man

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Yes correct. That’s exactly what happened. I hacked it outta that Yukon right before it was towed away. Time was of the essence.
So question is now, do I just junk this hacked up OEM harness and purchase a kit on eBay? Or is there a way to add a ground to the relay/fuse box, then connect to the frame?
Do not buy an aftermarket harness unless you enjoy melted wires on a hot day. Fix up that factory harness.
 
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Dantheman-2003

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Yes, there should be a double ground wire on the OEM harness. It's a ring terminal with TWO ground wires on it, one of those leads up to the relay/fuse block, and the second wire goes directly to the plug for fan #2. That plug has a blue and black, the other fan has gray and yellow wires. From the factory, the ring terminal is grounded to the frame on the passenger side, in the area right behind the bumper bracket. I grounded mine in the same area. I just attached mine to the bolt that holds the horn bracket to the frame right there on the passenger side frame rail.
It appears that you cut the harness just below the fans, that explains why you are missing the rest of the ground wire. You only have one wire connected to your relay/fuse block now. The other half of that wire, and the ground for fan #2 were cut off .
I think you answered my question here. All I need to do is tap the black wire coming from the fuse block and route a separate run to a grounding source.
 

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Appreciate the feedback. I get that the ground or grounds are to be fastened to a grounding source such as the frame. My question is, going back the other direction, where is the ground starting point at fuse block? As I’ve mentioned, I have 1 black ground coming out of the fuse block and eventually makes its way to one of the fans. Are you saying tap this black ground and pigtail off to a grounding point?
Correct. That ground needs to be connect to the frame/grounding point. The second pin on the first fan also needs to be grounded, that fan plug should have the light blue wire and a black ground wire. The other fan is fed by the yellow and gray wires.

I was in the junkyard yesterday removing a harness and I got a pic for you of where the factory ground point is for the fan harness on the 05-06 trucks. It's not easy to find (or see) unless you are specifically looking for it. It's basically hidden behind the bumper. It's on the passenger side frame, just below the radiator support, right behind the bumper.
 

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mattbta

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Correct. That ground needs to be connect to the frame/grounding point. The second pin on the first fan also needs to be grounded, that fan plug should have the light blue wire and a black ground wire. The other fan is fed by the yellow and gray wires.

I was in the junkyard yesterday removing a harness and I got a pic for you of where the factory ground point is for the fan harness on the 05-06 trucks. It's not easy to find (or see) unless you are specifically looking for it. It's basically hidden behind the bumper. It's on the passenger side frame, just below the radiator support, right behind the bumper.
When you say first fan is black/blue and other is yellow/gray - do you mean first fan = driver side?
 

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When you say first fan is black/blue and other is yellow/gray - do you mean first fan = driver side?
I honestly can't remember which is which as far as left or right. But I know for a FACT that one fan is black and blue, and the other fan is yellow and gray. To be honest, I'm not really sure it even matters to be honest which fan is left or right. But the wire colors on each plug DO matter. If you don't have the fan pigtails, I can check for you to see which actual pin is each color on each plug.
 

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I honestly can't remember which is which as far as left or right. But I know for a FACT that one fan is black and blue, and the other fan is yellow and gray. To be honest, I'm not really sure it even matters to be honest. If you don't have the fan pigtails, I can check for you to see which actual pin is each color on each plug.
I have the full harness, just didn't know which one went to which. You're right, probably doesn't matter. (I'm not OP)
 
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Correct. That ground needs to be connect to the frame/grounding point. The second pin on the first fan also needs to be grounded, that fan plug should have the light blue wire and a black ground wire. The other fan is fed by the yellow and gray wires.

I was in the junkyard yesterday removing a harness and I got a pic for you of where the factory ground point is for the fan harness on the 05-06 trucks. It's not easy to find (or see) unless you are specifically looking for it. It's basically hidden behind the bumper. It's on the passenger side frame, just below the radiator support, right behind the bumper.Thanks for the effort and explanation.
Correct. That ground needs to be connect to the frame/grounding point. The second pin on the first fan also needs to be grounded, that fan plug should have the light blue wire and a black ground wire. The other fan is fed by the yellow and gray wires.

I was in the junkyard yesterday removing a harness and I got a pic for you of where the factory ground point is for the fan harness on the 05-06 trucks. It's not easy to find (or see) unless you are specifically looking for it. It's basically hidden behind the bumper. It's on the passenger side frame, just below the radiator support, right behind the bumper.
Thanks for the effort here I do appreciate it greatly. My only variance to what your saying is, my black and blue goes to the passenger side fan, which I would consider the second fan. Correct me if im wrong. Now, the way I see it there is one black ground coming from the fuse block. That wire needs to connect to the frame (or alternate ground point) then splice off and connect to the fan port. Which in my situation goes to the fan on the passenger side of the truck. Is this right?
 

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Thanks for the effort here I do appreciate it greatly. My only variance to what your saying is, my black and blue goes to the passenger side fan, which I would consider the second fan. Correct me if im wrong. Now, the way I see it there is one black ground coming from the fuse block. That wire needs to connect to the frame (or alternate ground point) then splice off and connect to the fan port. Which in my situation goes to the fan on the passenger side of the truck. Is this right?
Technically, that ground isn't coming FROM the fuse block, it's going TO the fuse block. As it's wired stock, it's two ground wires, attached to the same ground/ring terminal. One wire runs directly from that ring terminal to the passenger side fan (black and blue plug) and the other ground wire goes directly to the fan relay block/fuse block. The relays are what switches it to send ground to the other fan (gray and yellow plug).
So in a nutshell, you just need a good ground wire ran to the black wire on the relay/fuse block and to the black wire on the second fan plug. If you want to run two separate grounds with two separate ring terminals, that will be perfectly fine so long as EACH one is firmly bolted to the engine block or to the frame.
 

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