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Discussion Starter #1 (Edited)
I have looked non stop and cant find a place to really explain wiring up towing mirrors on a Grade truck with only 3 wires.

I did a step by step on my 2011 Grade Crew Max along with pictures.

So i started out by testing all the available pins on the mirrors themselves and found the ground, running light and turn signal pin



Next I took a test light and found the blinker light connection. This needs to be pinned.


I ran 3 wires and electrical taped them...i didnt need but 2 because of the blinker and running light. I ran the ground to the door instead of using the 3rd wire. So really only 2 wires are needed



I took the wire and ran it through the door, it took some time but if you grab a little electrical grease it slides through the rubber pretty easily.





Next run the wire out the speaker hole, the rubber grommet could be cut and ran through it but i just placed it on the grommet and tightened down the speaker and it has a pretty good seal.


The 3 wires are pinned.

I had 3 pin connections from another connector so i just connected them together to the wire i pulled through the door


All cleaned up and taped up

Pinning the blinker for the connection

connection is pinned

I tied into the yellow wire, which comes on when the key is on and stays on with parking lights and lights on for the running lights on the mirrors.
the blue is the connection pinned for the blinker



The passenger side..same process...I havent pinned the bottom under the dash yet but when i do i will post pictures of what connections i ran them too





O I have always been a chevy gmc guy..but this is a great truck!
 

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Awesome! You might try getting a better pic of your mirror connector pinout so people can better see which wires go where. I have to turn the flash off to get good connector pics. I love seeing people do their own work. Looks great!
 

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looks awesome.

i wish i could have two mirrors
 

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Discussion Starter #5
Passenger Side Connections

The running light is already there, just tap into it.
Pin the blinker into the bottom connection


a better picture of the mirror connector
 

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Great post and it definitely save me a tons of headache trying to get my towing mirrors working. I am having the same problem with mine except i went a bit too deep by ordering a door wiring harness which cause more confusion. I now have 8 wires going in to my mirrors but the other end i have no clue where to plug them into. Look like i need to removes all the pin from the new plug and pinned into the old plug. I guess my question is:

Can you safely remove the pins from the plug? If not, where can i buy the new one and what type or size are they?
 

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Discussion Starter #7
Yea you can remove them. There is a pin removal tool. I bought one from radio shack but it's made for bigger pins. You may have to look online for a smaller pin remover. I'm sure they have them.
 

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Thank you for the quick reply Charles. I plan to work on my truck this weekend so if i could get my hand on a pair of pin removal that would be sweet. If i found your post earlier it would save me $180 from buying the new wiring harness for the mirrors. Please excuse my lack of knowledge but what is the exact name for the pin removal tool? I hope i could locate a radio shack in New Orleans :D
 

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Thank you for the help. Will look around for the pin removal and will work on the truck this weekend. Will post some pic when done.
 

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omg... some one final has a good write up on this..... this helps so much
 

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Discussion Starter #13
I did that already in the first 2 pictures. But what are you meaning by testing the mirrors.
 

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My towing Mirrors finally working without any wire being tab or cut. My guy currently working on getting the heat function to work. Will post some picture when i get it back.

 

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awesome post, I just bought my tow mirrors from 1aauto.com and should get them in sometime next week and I myself have the 3 wire harness and want to pin the running light and turn signal on my new mirrors I have coming in. I will let yall know how it turns out. wish me luck lol
 

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I know this is an older post, but where could I buy the pins from? I have all my wires run, just need to connect them into plugs......thanks and great write up!!!!
 
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