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Before I did anything 918 I would upgrade the power wire to at least #4awg or #2awg for that long of a run.  That #8awg isn't gonna hack it.  might be why you arent seeing the correct power,  I run #4awg from my batt to my 2 pill, that radio draws more amps than that. I bet your voltage is dropping under load and that is why you aren't seeing the power.  Maybe 4ft of #8awg might work, but no way a run from the front of the truck. JMO, upgrade to some heavy gauge power cable and Ditch those connectors for something that will handle the amperage better like Anderson connectors.