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Upfitter switches

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Old Jun 4, 2023 | 11:39 PM
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Originally Posted by mcmurm
Did you run the brown pass thru wire to the upfitter relay or the positive battery lead? It should go to the upfitter relay.
My understanding is that he ran from the brown wire located at the upfitter relay box, to the pass-through wire and on to his device. Problem is, that brown wire appears to be a run start power wire, not an auxiliary switch wire.
 
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