2.Devices That Require Connections to Vehicle Systems or Components

Follow the above procedures for the power and ground connections.

When the manufacturer's directions require the device be tapped into vehicle systems, such as speed sensor, door lock wiring, courtesy light circuits, etc., it is important to verity that the addition does affect the intended function of the circuit or its related components. I.E. reduce signal strength, create a current draw through switches relays and connectors exceeding their ratings, or generates electromagnetic interference.

If a device is powered by tapping into an existing circuit, the power feed to the device must be of equal or numerically higher gauge size than the source circuit. This will help insure adequate failure mode protection.

Splices, taps, and other wiring alterations should be soldered and insulated, preferably with heat shrink tubing to prevent corrosion and resistance buildup. Avoid the use of quick-lock type splices.