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Jeff,
How did you terminate the aluminum cables? They require special lugs. You can't put the standard copper terminals on AL cable. Could this interface be where your high resistance is?
Bill Harrelson
N5ZQ 320 2,150 hrs
N6ZQ IV 400 hrs
Chris,
The back battery (behind the aft bulkhead) does have a trickle drain via the panel's clock. This is why the voltage trickles down over time (days, weeks) relative to the isolated battery on the firewall. My observation is independent of this variable.
But when both batteries are fully charged, either with dual alternator outputs or plug-in charger, the delta is 1.2V to 1.3V as seen at nearly the same point behind the panel.
I had originally planned for copper cables, and measured the drop based on 6ft, but found the weight to high. Aluminum is used, and the drop is significantly greater than copper (as we know), and the result of roughly 6ft of 2 gauge is 1.2-1.3V demonstrated.
If this were the cranking battery, it has an impact on amps available tot he starter, which is another 3-4 ft further forward. When I have experimented with cranking off the aft battery, it definitely is weaker, a problem if cold start.
Jeff
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