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I have a 91 explorer that is having a strange problem. The charging guage is running on the very low end (around the N). I had the charging system checked and the system was not charging. I replaced the alterneator, cleaned the battery terminals and the problem persists. I have checked the fuses and they all seem to be fine.
The problem will go away at times as if there is something loose. I have noticed that when the battery light comes on when I start the car, everything will work fine. If the battery light does not come on when the car is started I have the charging problem.
Check the continuity of the circuit from the ignition switch, through the indicator bulb, to the regulator. Might be a bad connection at the bulb behind the instrument cluster.