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Discussion Starter #1
When I got the Leer cap, I had them install a 12 volt accessory port back there. I haven't used it until today. Trying to install a 12 volt fan back there.

The fan is good; you can plug it into the accessory ports in the truck and it works there but not here. I checked fuses going to the port and they are good. Checked the port for power and it has 12.5 volts. Yet, nothing I plug into it, works...?

Is it a ground issue or what is the problem? Thanks.
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You said you tested the port. How? Multi meter? Put one lead down in the bottom where the “nipple” hits and the other on the side wall of the port.

If you get ~ 12v there then you have one of two problems, IMO.
1) Your plug/port don’t like each other. Maybe you need to rotate the plug to find a sweet spot.
2) the fan pulls more start up amps than the wiring is able to provide. Could be too long of too small gauge wire. If you spin the fan by hand as you plug it in you would reduce the required start up amps to test this.

Disclaimer, I am not an electrician. Lol.
 

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Discussion Starter #3
Haha thanks. I used a multi meter. I have rotated the plug and got nothing. I also tried a phone charger, a led headlamp charger and a small air compressor I have and none of them worked. Yet they work in the truck or car.

I also got a longer plug because I thought the original was bottoming out so I got one that wouldn't and the fan still doesn't work.
 

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Discussion Starter #7
I asked the same question on ColoradoFans and one guy said to check and make sure the ground is connected. I wondered if that wasn't the case. I just wasn't sure though if I could still have power, even if there was no ground connected.

I have yet to check yet though, as you have to pull the taillight housing off (not that it's difficult) to access where they have the wiring hid at. Going to do that tonight or tomorrow.
 

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You wouldn’t have power on your meter but maybe the ground (or power) is barely hanging on.

You can check the ground with your meter using the continuity setting. Wouldn’t need to pull anything apart to check that.

If you can’t get amps then you can’t run the device even if you have voltage.

Kinda like when you have a nearly-dead battery and the lights come on but the starter doesn’t do anything but click.
 

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Discussion Starter #10
You said the ground might just be holding on. That was it. Went to take the screw out that they had used to anchor the ground cables on to the frame and it broke off. I cleaned up the area and got the paint off and put a new screw in and the port works now. Praise the Lord =)
 

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im running 91 up style dsm ecu and harnes i wired the tach but its not working. im going to assume that a tach adapeter is needed can anyone confirm this?
 
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