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I do a lot of EOC coasting (up to 20% of tank miles). Last summer I noticed my volt gauge showed 10.8 volts at the end of a very long EOC (lights on).
After that I started "trickle" charging twice a day with a 3.3 amp CTEK charger. I charged overnight and also once I got to the shop. It took about 2 hours each time to charge the battery back up. I noticed about a 3 MPG pick up from this procedure, because the alternator was not charging as much while driving.
This is what got me looking at adding the alternator delete on the red 92 VX.
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