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Power Strokes
6.4 Tech
Trailer charge line draining trailer battery while engine off
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[QUOTE="kleake, post: 1526599, member: 25987"] It's not killing the battery on the truck, which is normally what it will kill due to the trailer drain. The truck has a relay to shut off the charge line to the trailer when you turn the key off, what is happening is the truck is then killing the trailer battery while sitting due to some draw on that charge line on the truck side. My utility trailer can sit for weeks by itself and the battery is fine, but plug it into the truck overnight and it's at 0V. The truck starts right up and starts charging the trailer again. Some sort of parasitic draw in the truck wiring. [/QUOTE]
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Trailer charge line draining trailer battery while engine off
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