Ignition switched 12v power source under the hood

[jja]

What could that be on a '07 3.7 kj? I can't really find any info on that.

 

[renegade 04]

What do you need the switch power for?

 

[jja]

I am installing a LPG conversion kit and the computer that comes with it needs that input.

 

[Billwill]

I am installing a LPG conversion kit and the computer that comes with it needs that input.

You could stick your voltmeter on each fuse in the relay box under the hood and check which fuse has +12 volts on it with reference to ground with ignition OFF.

Then turn the ignition ON and re-check the fuses and see which fuse suddenly now has power when it previously did not.

Or you can download the 2006 KJ Service Manual here...includes circuit diagrams and should be close enough to the 2007 model!:shrug:

Index of /manuals/Jeep/KJ

 

[M38 Bob]

Bill, for most of us the test light would be a lot simpler!:icon_lol:

Bob

 

[megatone]

Bill, for most of us the test light would be a lot simpler!:icon_lol:

Bob

I'm test light certified.

One thing to consider is not only which fuse has ignition switched power, but also which of the fuse blades has the power coming into the fuse. Any power accessory you install should have it's own fused power supply wire and NOT be using the power coming 'out' of the factory installed fuse. When loading power accessories onto a factory installed fuse, you may put too much of a current (amperage) draw on that fuse and weird electrical things may happen.

 

[Billwill]

I'm test light certified.

One thing to consider is not only which fuse has ignition switched power, but also which of the fuse blades has the power coming into the fuse. Any power accessory you install should have it's own fused power supply wire and NOT be using the power coming 'out' of the factory installed fuse. When loading power accessories onto a factory installed fuse, you may put too much of a current (amperage) draw on that fuse and weird electrical things may happen.

Yep, either add your own fuse or rather fit a relay to be activated by the power at the fuse you find that has switched power....relays draw next to no current.

Then run +12 volts from the battery, via an inline fuse, through the relay and to your device that you want to power up!:icon_smile: