Switched 12v Source to Use

[monster1213]

I am by no means an electrician, just trying to share the knowledge I came across in my search for a good switched 12v source to use inside the truck. You can use this for any component requiring 12v power source with the key in the on position (aka Hot Accy/Run). I was looking for power to my wideband O2 sensor. I decided to use the SEO connector in the Mid BEC to avoid splicing into other systems wires and without using an 'add-a-fuse' in the fuse box and having wires everywhere. I used the diagrams attached below and metered everything out before unhooking the battery, everything checked out and my O2 sensor is working good so far.

 

1. Locate the Mid BEC (black box) under the driver side kickboard behind the parking brake.

 

2. Remove cover and locate the SEO (Specialty Equipment Option) connector C8, in the upper left hand corner of circuit.

 

3. You could buy the female GM connector for this, but I chose to use female electrical connections I had laying around to tap into only the posts that I needed. The upper right hand terminal is your switched 12v power (Hot Accy/Run) and the lower right hand terminal is your ground. Looking at this diagram, don't forget to inverse the picture as if you were plugging the connector in.

 

4. I added a 10A inline fuse to my positive lead to protect my wideband and truck's system and connected to both terminals.

 

5. Brought my O2 sensor through the grommet in the firewall behind the Mid BEC.

And into the engine bay beside the master cylinder

6. Ran it along the frame rail

Over the front driveshaft and into the bung on my collector.

7. Temporary wideband gauge installation until I add fuel pressure gauge and make a pod.