Originally Posted by
drivesafe
Hi Captain, as Dave posted, I would start with getting the meter checked and then start readings all over again because the SC40 and SC80 are both set to cut-in at 13.25 volts, not 12.7 and even if the voltage is actually higher, once the batteries are connected, unless there is a problem with the auxiliary battery where it is very flat or faulty, the voltage should not drop back more than about .1 of a volt after having the motor running for 2 and 1/2 hours.
Cheers.