Hello, Whether X-switches (relays) or isolators (diodes) are used, the problem remains the same. The alternator's voltage capability is high enough not to be of a concern. The key consideration is that the voltage is sensed (using a separate non-current carrying wire) at the main battery's terminals, and not at the auxiliary battery. Thus, to best split the alternator's output, the resistance of the charging path from the main battery to the auxiliary battery must be kept very low. This means increase the size and shorten the wire to the auxiliary battery as much as practical. In addition, using an X-switch (very low resistance) rather than an isolator will improve the situation. Mike Michael A. Radtke - Z74 Voice: 602-862-4897 Bull FAX: 4853 13430 N. Black Canyon Hwy. Phoenix, AZ 85029 Email: m.radtke@bull.com
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