Went for a ride with my riding buddy yesterday and noticed his brake light was staying on and then flashing as he applied the brakes, also noticed when he cranked it up it was slow to turn over, after riding for an hour or so the light was back to normal operation. We talked about this and decided his battery could be going south. He has a pigtail for a tender and wanted to know if the battery voltage could be measured through it, the reason being the bolts that hold his seat on are stripped so he has to remove the saddlebags and sissy bar mounts to get the seat off, his bike is 08 softail custom like mine. Would the voltage be an accurate measurement at the pigtail. Thanks!