When I installed a Delphi XM in my fiver, I wired a 12 volt accessory recepticle (cigar lighter) and then plugged in the power cord. The power cord is your step down and I don't think there is an easy alternative.
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2001 Ford F-250 PSD, Line-X, 3 ISSPRO gauges, TTM, Cyclone Fan, pulling a MobileScout 30RKS (loaded), Maxxair, Honda EU 2000. USAF retired.
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