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Old 03-20-2016, 06:22 PM
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12v power outlet wiring options...?

So I'm trying to wire up a 12v power outlet in the rear of my TJ. I really don't want to run a power wire all the way to the rear of the tub. There is a hardtop wire harness sitting back there unused, and will probably never get used.

My question is, can I wire up the 12v outlet to the hardtop wire harness, or is there a better option?

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Old 03-20-2016, 06:25 PM   #2
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if you want to run an LED or some other very low amp draw device, sure. but i'd do some research before running anything of decent power draw off of it.

what were you planning and what year jeep?

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Old 03-20-2016, 06:36 PM
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97 TJ, and I was figuring the 12v for utility work, power inverter, phone charger, 2-way radio charger, whatever. Not much into useless lights and flashy things.

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Old 03-20-2016, 06:47 PM   #4
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97 TJ, and I was figuring the 12v for utility work, power inverter, phone charger, 2-way radio charger, whatever. Not much into useless lights and flashy things.

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If you have a rear window defogger circuit in that harness, that will likely be your largest amperage circuit. On a 1999 it's a 12 gauge (gray) wire on a 40 amp fuse.
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Old 03-20-2016, 06:59 PM
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This is what my plug looks like.





This is a diagram I found online.



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Old 03-20-2016, 07:02 PM
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I'm assuming the black and white-striped wire is the one you mean?

If so, is this an always on circuit or is it controlled by a switch? If it's a switch, I don't seem to have that anywhere on my dash, just one for the wiper/washer...



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Old 03-20-2016, 07:35 PM   #7
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Connected to a relay in PDC under hood
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Old 03-20-2016, 09:25 PM   #8
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I'm assuming the black and white-striped wire is the one you mean?

If so, is this an always on circuit or is it controlled by a switch? If it's a switch, I don't seem to have that anywhere on my dash, just one for the wiper/washer...

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Looks like someone installed the hard top harness after the fact and didn't install the defrost switch. Either way you'll want to jump the defrost relay to be always on, from the factory it is a time delay circuit controlled by the gauge cluster.
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Old 03-20-2016, 09:30 PM
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Looks like someone installed the hard top harness after the fact and didn't install the defrost switch. Either way you'll want to jump the defrost relay to be always on, from the factory it is a time delay circuit controlled by the gauge cluster.
How would I go about doing that?

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Old 03-20-2016, 09:43 PM   #10
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Rather than always on I would make it only on with accessory or on at key so you won't accidentally leave something plugged it that runs down battery while jeep is parked
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Old 03-20-2016, 11:50 PM
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The rear port would be basically "on-demand" and not used all the time. Besides, I don't want to have to turn the jeep on, activating all the other systems just to plug something in. Anything I plug into the rear port wouldn't be plugged in for very long so this isn't a concern.

I've just never done this with a relay. Would I just replace the relay with a different kind or do something else entirely?

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Old 03-20-2016, 11:52 PM
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Also, if there is no switch visible, does that mean there needs to be a switch installed somewhere for that line to work, or is it directly connected to the relay?

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Old 03-21-2016, 07:19 AM   #13
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You need a switch or a jumper or a key switched wire to trip the relay or replace the relay with a jumper of adequate wire size

My bet is you will run down a battery if you leave it having constant power
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Old 03-21-2016, 09:51 AM
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I ran a dual 12v direct from the battery on my 95 with constant on power. I even left a triple usb charger plugged in to it 24/7. Never once did I have to Jumpstart my YJ. I appreciate the advice and the concern, though.

Thanks everyone!

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Old 03-21-2016, 01:24 PM   #15
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There is always this option as well for accessory wiring
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Old 03-21-2016, 07:19 PM   #16
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If that is the factory HT wiring as it looks like it is, you should have a relay in the PDC marked rear defrost or HBL or EBL relay probably the front one on the fender side. Pull the relay & the terminal in the relay socket closest to the fender (#30) should have 12v power from fuse 15 (30a). If you make a short jumper using 12 gauge wire & jump between terminal #30 & #87 (across from 30, furthest from the fender) you should have constant 12v (30 amp) power to the black/white wire at the back connector. No switch needed. That should get you what you need. Same as what Digger says.
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Old 03-22-2016, 12:03 AM
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Good info. Thanks. One question. Where is that wire in the photo located?

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Old 03-22-2016, 12:31 AM   #18
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That is 1 of 2 wires (1 switched & 1 unswitch) tucked behind the fuse block on some yrs. from fuses 18 & 19. I think it started in ’98 ‘til about ’01.

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