I am having an erratic charge problem. It will charge for a few seconds and then quite. I've tried the test in this section on checking the external reg. system and have found the problem. With the key on engine off I only get 2.9 volts on the blue wire and 2.9 volts on the brown (supposed to be blue 10.5, brown 13). Any ideas of a fix, this car has console gauges.