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Old 05-21-2013, 08:58 AM   #1
garyd9
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looking for always on fuse in passenger compartment

I'm trying identify an "always on" fuse in the passenger compartment fuse box (that I can piggy back on.) This is being used for the "homelink" function of a autodimming mirror. (I'm using #85 for the switched power.)

I'm currently using #81 (radio frequency receiver), but I'm wondering which specific car function that fuse is associated with... it might be the keyless entry/start RF receiver, or it might be the TPMS RF receiver, or both. I'm having odd issues with TPMS warnings, so I want to eliminate this variable in trying to diagnose.

Because several circuits stay live for a limited time after the car is turned off (as well as the fact that I don't practice yoga), I'm having a hard time identifying an always-on fuse that would be good to use. For this very low wattage device, I'd prefer not to run directly to the battery.

edit: ANSWER: fuse #65, 10A, Luggage compartment release. See post #7 below for more information.

Thanks
Gary



Last edited by garyd9; 05-21-2013 at 07:36 PM. Reason: added an answer for those searching
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Old 05-21-2013, 11:39 AM   #2
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Try looking for the lighted vanity mirror fuse. That's where they draw power from for the homelink on the 12's and it's powered all the time
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Old 05-21-2013, 12:36 PM   #3
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No luck so far finding that fuse. I've also checked both the 2013 and 2012 focus owners manuals - and neither of them reference the fuse used for homelink or the vanity mirror lights. :(
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Old 05-21-2013, 12:53 PM   #4
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Then just tap into the power lead under the headliner that feeds the mirror.

Or get a visor with the homelink built in out of a 12 Ti and swap it in. It is literally plug n play. Several members have already done it. BTW it lists for less than 100 bucks new.
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Old 05-21-2013, 01:24 PM   #5
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I appreciate the suggestions - but I already have the aftermarket auto-dimming mirror w/ homelink mounted and the wires already run to the fuse panel. It's just a matter of finding a better constant power fuse to tap instead of the one I'm using.

Instead of taking random guesses as to which circuits fuse constant power (as opposed to ACC or delayed ACC power) I was hoping that someone with more experience (and knowledge) with this vehicle's electrical would save me the trial and error it would require for me to figure it out. (As well, each wrong guess involves physical pain for me as I try to reach the panel hidden behind the glove box.)

I appreciate your suggestion to use the same fuse as the vanity mirror lights, and I'm sure that would work - if I could only figure out which fuse that is.
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Old 05-21-2013, 01:48 PM   #6
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Quote:
Originally Posted by garyd9 View Post
(As well, each wrong guess involves physical pain for me as I try to reach the panel hidden behind the glove box.)
I know how you feel, I'm not a small person either, and my knees keep reminding me how old I really am.
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Old 05-21-2013, 07:35 PM   #7
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Found a decent answer: fuse #65, 10A, Luggage compartment release. This appears to always be on, and maxes at 10A (so it doesn't overload the add-a-fuse.)

I also tried #60 (10A, interior light, door switch pack, etc, etc) hoping it would always be on (on the theory that it's always possible to manually turn the dome lights on), but I couldn't fit the add-a-fuse in there because there's ZERO space to the left of the fuse (and the add-a-fuse I have needs a tiny bit of space.)
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Old 06-26-2013, 03:00 AM   #8
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Question, is circuit 85 ignition hot or is it retained power hot? Im looking for a fuse thats ONLY live when the ignition is on, and no time else (no retained power)

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Old 09-07-2013, 08:16 PM   #9
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Originally Posted by TheHumbleGeek View Post
Question, is circuit 85 ignition hot or is it retained power hot? Im looking for a fuse thats ONLY live when the ignition is on, and no time else (no retained power)

Sent from SGH-I747M Via FF Mobile, Care of CSIS ;-)
I too need a fuse that's tied to the ignition switch, to hard wire my radar detector.
The retained power is making it a difficult task.
Thanx in advance.
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Old 09-07-2013, 09:04 PM   #10
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I too need a fuse that's tied to the ignition switch, to hard wire my radar detector.
The retained power is making it a difficult task.
Thanx in advance.
sorry i cant help the OP... but here is a link for you guys looking for ignition switched power.... look at post #13. it shows the passenger fuse block and the locatino of the switched fuse.

http://www.focusfanatics.com/forum/s...=276935&page=2
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