Jeep Garage  - Jeep Forum

Jeep Garage - Jeep Forum (
-   Troubleshooting/Problems (
-   -   12V switched power source? (

StoneCold 08-28-2011 08:29 AM

12V switched power source?
OK guys n gals, got myself some gauges and I'm looking for a suitable 12v+ switched source to run them from.

I've been searching and can't seem to find an idiot proof answer. I know I can tap into the igniton wire, but which one is it? Or are there any easier/ better options?

I may be able to find the info in my Haynes manual when I get home, but it would be handy to know, before I get there, so I can just crack on and get them fitted.:D


Frango100 08-28-2011 09:19 AM

Re: 12V switched power source?
Hi Aaron, there are ofcourse a lot of possibilities, but here are a few:

1) On the junction block under the steering wheel fuse 21 (10A), a Dark Blue/White wire runs from the fuse to A/C compressor/EVAP purge solenoid and shift assy. Only under power in Run. When you put a lower amp fuse for the gauges, you will never blow the 10 A main fuse.
2) On the junction block fuse 30 (10A), a White/Red wire goes from the fuse to the radio only, but has power in Run and Acc.

cheapjeep 08-28-2011 09:51 AM

Re: 12V switched power source?
Aaron these are really great for this sort of thing.

StoneCold 08-28-2011 10:07 AM

Re: 12V switched power source?
Cheers guys:thumbsup: That's some great info.

Frank, I'll probably run with option 1, due to the location, it should be easier to run the wiring.:D

Dave, do those fuses prevent the existing ones from blowing? As far as I understand, I have to be careful not to draw too much current from a secondary source or something:confused:

Sorry for sounding like such a noob, vehicle electrics is not my forte by a long shot :lol::slapfight:

Cheers again:thumbsup:

cheapjeep 08-28-2011 10:52 AM

Re: 12V switched power source?
Not sure about that one but a lot of them have 2 fuses.1 for the original circuit and 1 for the tap. At the very least everything is still protected through a single fuse on the cheap ones.

Frango100 08-28-2011 11:15 AM

Re: 12V switched power source?
Gauges are very low power consuming, so that should give no problem for any of the circuits.

All times are GMT -5. The time now is 10:50 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community