- 1). Connect the red main power wire to a battery source either at the ignition switch or the fuse terminal (you may need to unscrew and open the fuse terminal's door with a screwdriver). Then, use a voltmeter to find a wire that has continuous power while the marine's engine is not running. If working on a switched circuit, use the switch's accessory side or a fuse slot on a fuse box that has power only while the marine engine is turned on. Thus, the audio system can only operate when the engine is running.
- 2). Strip the insulation one inch from the end of the main power wire with a wire cutter and slide a short length of shrink wrap around its end. Install the appropriate terminal end, then use a wire crimper to crimp the end. Move the shrink wrap over the crimped end and heat the shrink wrap until it is tight upon the area. Then use a liquid insulator to cover the area.
- 3). Connect the yellow memory wire to a continuous power source. Connect the wire in a similar fashion described in Step 2, remembering the coat with a liquid insulator.
- 4). Connect the black ground wire to a ground on the engine. Connect it away from any moving parts or heat sources. Again, use a similar method as described in Step 2. Be sure the ground is clean of rust.
- 5). Connect the audio speaker wires, with the colors coordinated for each speaker. For instance, the speaker should have two wires of the same color as well as a black stripe indicating the ground wire. If the positive wire is gray, then the gray wire with a black strip is the ground wire. Proceed to attach the wires to the speakers in the following sequence: Positive to positive and negative to negative. Fixture the shrink wrap, crimp the terminal and heat the shrink wrap. Then, install the terminal on the speaker and cover the terminal connection with liquid insulator.
- 6). Duplicate Step 5 for all the audio speakers, making sure to use wires of the same color for each speaker. Look at the audio system's manufacturer supplied diagram to see which wires operate which speakers. This is necessary to make sure the balance and fader functions work properly.
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