Mercury Customs Central Wiring System

All-in-One Circuit Board

Joe first ran all the wires to the point on the frame where the board would be mounted. If you’re going to take on a rewire, be sure to disconnect the battery before any wiring is done. For this build most of the wires were routed in the frame, so they were all left on the long side until Joe was sure the board was definitely going to be placed on the seat post. Tip: A little extra wire can be hidden by the cover, so leave the wires a bit longer than you need. You never know what will come up later.

The board has the following components: a starter relay, a 30-amp main power fuse, two 20-amp fuses inline, a four-position junction block for power and ground, and two eight-position junction blocks for power and ground.

The kit also comes with a wiring diagram and basic installation sheet. These are only suggestions, because Joe knows every builder does things his own way. The board, however, is clearly labeled, so even if you have never wired a bike before, this is an easy-to-follow diagram.

Next, all the ends of the wire were “tinned” (treated to a dab of solder). This will keep the wires from fraying as well as help with installing the wires into the module. It also helps when tightening the screws by giving them something solid to bite on.

For this project, the bike needed the starter relay installed. Joe set up the board so the relay could be used any way the builder sees fit.

Then all the wires were installed into the lead connections. For some added peace of mind, use a little blue thread locker on the screws, even the ones not being used. This will keep all the screws in place with a good connection and will keep the others from rattling.

Joe then attached the circuit board to the mounting plate with four small screws and a little thread locker.

Joe welded two threaded bungs to the frame. Because the footprint of this board is just 1×4 inches, it can be placed under the seat or gas tank, or even under a dash setup if you have one.

The only thing left was to install the cover over the board, which just snapped in place.

Nice, clean and to the point-the board is almost unnoticeable.

If you do experience any electrical problems, it is easy to get to, and you should be able to easily isolate where the short is located.

Wiring-scary. Well, actually, not anymore, with the help of Mercury Customs. Owner Joe Takai and his wife Pam have come up with a central wiring system for custom builds that brings all wiring connections to one mounting point on the bike. One mounting point not only makes getting to your wires less intimidating, but it will also make your bike better-looking for around $150.

Mercury Customs has developed wiring solutions for both the professional and home builder. The design is housed in a streamlined 1×4-inch footprint (circuit board), allowing for easy mounting wherever the builder decides to place it. This kit comes with a mounting plate only 1 inch longer than the board itself. The power-distribution terminal block is labeled, providing power and ground for up to nine electrical functions. In addition, an industry-standard micro starter relay is included, which allows connections to be made with any low-power starter button. The relay can be removed if no electric starter is required.