The 12-Volt Power Receptacle:

I looked in Wal-Mart, Auto Zone, Advanced Auto Parts, and boat shops for the right 12-volt receptacle. I should rephrase what I just wrote. I was looking for the best 12-volt receptacle for my needs and likes. I say this because I found 12-volt receptacle that start as low as .99 cents and as high as $19.99.


I choose to buy a 12-volt receptacle that is made of corrosion-resistant marine-grade materials and has a watertight sealing cap. The receptacle mounts in a 1-1/8" diameter opening, and uses a threaded locking ring to secure from behind or optional mounting plated to secure from the front.

The 12-volt receptacle is rated at 15-amp capacity, which is more than enough for my portable air compressor.

The Wire:

Crimp-on Connector Color Codes

Red 18-20-22 gauge
Blue 14-16 gauge
YellowY 10-12 gauge


I used the wire chart as a reference. The 12-volt receptacle is rated a 15-amps and after routing the wire the longest stretch, of wire, would be about 8 feet, so I decided that 14ga wire would more than adequate. The 12-volt receptacle came with 2 crimp-on connectors, but I needed 2 more. I already had some on hand from other projects.

The In-line Fuse Holder:

To provide protection to the electrical circuits from overloads you must use a fuse or a circuit breaker. There are several types of in-line fuse holders. There are ATC, Mini, Glass, and circuit breaker type of fuse holders. For the power port I used a 15-amp fuse.


The Layout:

Connection to the M/C Fuse Box:


Connection to the auxiliary fuse block with a master ground block:


This is the most suggested wiring for a power port: