Ignition-on power source in engine compartment?

[rt66er]

I have searched and not found an answer. Anyone know of an ignition-on (non-continuous) source of 12v power under the hood? I know I can use a fuse tap in the fuse box, but is there an alternative?

[2017SierraSLT]

Thanks for all of the reply’s guys, I really appreciate the help!

I found the 12v ignition source!

It is located in the Mid-Bussed Electrical Connector in the driver side floorboard, behind the parking brake. It’s at port X-14 pin # 7.

Here’s a picture of the MBEC:

Here is a close up of the empty connection bay. Pin # 7 is a true 12v ignition source.

Thanks again for the reply's guys and I hope this helps someone else.

[rt66er]

Thanks for the reply, but I'm looking for power source under the hood (engine compartment) not under the dash.

[2017SierraSLT]

There isn't one unless you tap into another circuit.....

[elite0259]

I used a fuse tap on the HVAC fuse, and ran that to a relay (less than 1 amp draw each)... So far my truck doesn't seem to mind, I think I powered 2 relays simultaneously on that circuit.

[intheburbs]

In the main load center, on the X2 connector, either pin A5 or B4 is an ignition-on power source. These two pins are connected to the aux battery relay on the TP2 option. I don't recall which one is the hot one, should be simple enough to test with a circuit tester.and a few terminal connectors.

 

Don't forget to disconnect the battery before you raise up the tray containing all the fuses.

[rt66er]

Thanks!