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Old 07-15-2016, 10:22 AM
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Tap into Cigarette wire or Fuse box to power new Head Unit?

I have seen a few people on the forums recommend to tap your aftermarket HU into the cigarette wire so your new HU can stay powered on just like the stock unit does after you turn off your jeep.

Tapping into the cigarette wire for the HU would probably draw more current and more likely to blow a fuse. I am sure the fuse is a smaller fuse to begin with for the cigarette wire.

My question is would it not be better just to run a fuse tap to the fuse box instead?

If other users do not have any issues with their setup (cigarette wire tap) please let me know. I am just looking for the best way to to wire up my new Head Unit.

Thanks in advance.

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Old 07-15-2016, 10:59 AM   #2
Knows a couple things...

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Most head units are powered via three wires...
1) the ground wire which is usually black.
2) The main power wire, usually red. It is usually connected to a circuit that is turned on & off with the ignition switch. It can also be connected to a circuit that remains on all the time if you want the radio to be playable with the key off.
3) The head unit's 'keep alive' or 'memory' wire, often orange, that keeps the clock and radio station settings in memory. This wire has to be powered by a circuit that always stays live whether the key is on or off.

Since you want the radio to be playable with the key on or off, you can physically connect the above mentioned #2 and #3 wires above together and power them from a circuit that always stays alive. But since you're replacing the factory radio, I would just connect those two wires (#2 and 3) to the factory radio's main power connection at its plug for the factory radio. One wire in the factory radio connector wiring will be always hot with +12v, connect those two power wires (#2 and 3 as above) to that wire.

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Old 07-15-2016, 02:29 PM
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@Jerry Bransford - Thx for the clarification!
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