I made the following harness to draw 12 v from the battery for my GPS or for recharging the smartphone. The connector is useful also to connect a battery charge mantainer during periods of long non-use.

The 10 A fuse (a regular ATO/ATC blade fuse) is mounted on two faston connectors. The output is a 180923-0 TE Connectivity 2 way female unsealed faston connector. The fuse blades are 5.3 mm wide, but we neverthless used two 6.3 mm faston female connectors (The connector has been slightly squeezed to obtain a more solid connection). The 180923-0 connector accepts 6.3 mm faston female connectors, with the locking lance.

The eyelet terminals connect directly to the battery, the connector is reachable near the main beam of the motorcycle frame, on the left side.

RAM Mounts is famous for its system using the rubber balls as joins, the most effective is the B size, where the ball size is 1 inch diameter.

I built a steel adapter welding together two pieces of standard soft iron profiles. The holder fits the bolts of the steering handle. Here are the measures, a 3D model and the pictures of the final result. The actual phone/GPS holder is a RAM Mounts compatibile one, which integrates its B size ball and the short double socket arm.

• The base plate is made from a flat profile 20 mm, 4 mm thickness, 74 mm lenght.
• The support arm is made from an L-shaped profile, 20 x 20 mm, 3 mm thickness, 130 mm lenght.
• Two cylindrical spacers are placed under the base, the outer diameter is 16 mm, the inner hole is for an M8 bolt, i.e. an 8.2 mm hole. The front spacer is 20 mm height, the rear one is 14 mm.

Here you can download some files to help you in making the piece:

• An OpenSCAD model. It contains both a 3D view of the complete object and a 2D outline from which you can print a measures reference sheet.
• A PDF file with the measures. It can be used as a reference to cut the iron profiles and to drill the holes.