Basic Installation Concepts Always attach your BATCAP directly to amp. Use approved terminals on all wire ends. BATCAP may be used as a distribution block as in Fig. 2. More than one amp may benefit from a single BATCAP depending on the application. The least voltage drop can be achieved by running the negative wire from the car battery, equal in size to the positive run, all the way to the amps. Copper conducts dramatically better than steel. (Ignore statements to the contrary) When grounding your BATCAP, avoid chassis grounds. Always fuse power source.