quote from OP: "charged both batts for 12 hours (all day thursday 5/14). readings start out as 13.3 house, 13.0 chassis and at end of day, both read 13.78 w/parallax on, and 12.75 when off.
12 hours later, house is 12.66 and chassis is 12.70. i predict they will be near 12.56 house and 12.50 chassis in a week."
now, 24 hours later, house 12.76, chassis 12.48. i guessed right, but chassis batt did not wait a week to drop to 12.5.
i then turn house disconnect ON, and bam, both house and chassis are 12.76!? i will leave it ON for a day or more and monitor.
cranked engine up, and alternator reads 15.15 in both batts, and drops to 14.7 in a few minutes.
i have often seen this 12.5 chassis reading and been bothered by it.
