All, for some odd reason the ACC 12v wire that runs to my radio is dead (no power). I am looking for an alternate source for ACC 12v? What would be a nice wire to tap into for the same purpose of running a radio. Thanks!

 

Did you check the fuse ( for the radio ) for power on both sides ?

This should be done for all 3 fuses, but the one to focus on is F22 ( fuse at the output of the accessory delay relay ).

Are there any modifications ( upgraded HU, AMP, lights, etc ).
- If so, how are they installed.

 

Last weekend I installed a new Pioneer AVIC F700BT. Half way thru the installation this source went dead. I changed the #7 and #20 fuses, but was not aware of the F22. I will have to check that. No modification.. just hooked up the new radio with a wiring harness and tapped the sufwooder amp to the same power source.

 

Might want to put the sub on a separate fuse. You are asking for problems overload the truck's wiring.

Use an Add-a-Fuse in that slot if you want the same hot source.

 

That F22 fuse does the door locks, correct? I believe this is why I never checked that fuse because they were still working. I have not had the time yet to check it, but will after work today. If that fuse is good also, do I have any other options for a ACC 12v wire? I was looking at the fuse box over the weekend looking for another fuse to tap, however I was uncertain if those were running off a relay or not. Any suggestions?? Thanks again!!

 

Other options ? Figure out what you did to the truck by adding stuff.

Did you check the upgraded HU, to see if the wiring got damaged in the installation ?

If that fuse is good, and it is not working at the radio, you have a broken wire some where, that could cause a problem later.

 

Found this thread that has more info in it

https://www.f150online.com/forums/li...like-help.html

Which is correct, this thread, or the other one ?

If you want help with this, you need to provide all the info, not just parts.

 

I am not sure I am following, both post are what I did. As I said before I currently am not getting power to the ACC 12v wire that runs to the radio harness. I checked the #7 and #20 fuses. Both were fine, but I replaced them to be sure. I have not checked the #22 fuse, but will do that tonight (I was thinking is was fine since the door locks were still working). The HU is working fine as I am running off another power source. If I did cause wire damage on the radio harness 12v ACC, I was hoping someone knew of another source where I could get the same ACC power.

When I test the #7 fuse, my tester does not light up, the #20 does light up. This made me think that I have uncorrectable issues... which lead me to ask the question about another source.

Sorry if this is confusing.

 

You used an ABS light for power to something ?

You do not have power on Fuse #7 ( no note of that in this thread ).

What accessory circuit did you add the backup camera to ?

Bit of things left out, that I got in a quick read of the other thread.

Seems to have glued, spit and duct tapped stuff together, and I am not sure of where you are at.

 

Sorry I am not being clear enough... I do appreciate the help.

1) As a temporary solution to get my radio to work I have tapped into the power for the Airbag light directly above the radio doc. This however will only provide power when the truck is running; not when the key is switched to ACC.

2) When I place my tester to the #7 fuse it is not lighting up, so I am under the assumption that I have no power to this fuse. The fuse is brand new.

3) I decided to just power the backup camera off the reverse light. This only give me power while in reverse, but that is good enough. I guess I don't need the camera on all the time while I am driving.

This is not my first radio installation, I just last year installed the same radio in my wifes '08 Highlander. This is however the first time I have every lost power to the ACC wire. Everything I use is either wire tapped or I use wire connectors. The Mark LT wiring system is a little more complex than the Base Highlander, which is why I thought I would ask the question here. I have already caused sometype of issue with the ACC power wire, no reason to mess something else up.

My reasons for posting are to a) if possible fix the 12v ACC wire so I have power to it again. OR b) find another source that will provide power when the truck is turned to ACC or on.

In my post under the Lincoln section is that the radio is currently working, sub is working, backup camera is working. My issue is that I don't like the way that it is currently powered and would like to correct that if possible. I would prefer to have it work how it was with the ACC power.... runs when key is on ACC... stay powered until the doors open... etc.

 

UPDATE! It was the #22 fuse that was blown...power returned to the ACC 12v wiring harness on the radio. I rewired it back the correct way and things are working great!! I just dawned on me that I was stupid when originally wiring it. The previous dozen or so radios I have done since I was a teenager all powered down when I turned the key off. Stupid mean forgot the the Mark LT keeps power to the radio until a door is opened or after a certain amount of time. I must have shut the key off and when to wire something and causing the fuse to blow.

Thanks SSCULLY!! I never even thought about this fuse.....great help!!

Now I just need to figure out the PAC SWI-PS unit......