Check both the ground and positive side battery cables, Be sure the body grounds are good as well as the battery itself. An internal break in the battery could cause this just as easily as a bad cable.
But be very careful. If there is a break inside the battery it could spark, that could cause the battery to explode as they have a hydrogen gas in them from the charging process.
Flickering lights that get better under load suggests a bad ground or battery.
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Wednesday, October 25th, 2017 AT 11:28 AM