Re: Lighting dims question
Tail lamp ground is possible ground issue. Do as you have done already, add a temporary ground to the lamp,bypassing the fender and body. Battery may be hurting due to high charging rate - 2- 4 amps setting, don't worry about the momentary negative readings. if amp readings are read from the dash, invest in a meter to go inline and don't rely on the dash meter . Check inside the junction box for loose nuts & solder joints.
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