Thanks. No I do not have a Battery Maintainer. The truck is started up and run around the block a few times during winter months.
I just checked again and after having sat for 3 hours the voltage reads less than 12. If at higher RPM it only gets up to about 12.8.
I do have a high quality master cut off switch under the seat and I do not think it contributed to the problem. I have had it in place for about 5 years and turn it off each time the truck gets parked in the garage.
