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Just check issues: batteries (2 new 3 months ago)=Good. 7 way female in truck=good. Junction box in trailer hitch-12.7. Rear top left marker=8.9v.
Removed six (6) side incandescent marker bulbs and rechecked voltages.
front 2 side markers=L-11.63v Rt 11.52
middle 2= 11.28 both
rear 2= 11.05 both
Left taillight= 11.08
Top left marker=10.98v GAINED 2.08 volts by removing six (6) incandescent marker bulbs.
Appears easiest solutions is replace ALL incandescent marker bulbs with LED. Now, trying to find those.
Thanks everyone.
Jack
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