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The Volvo dealer here recommended and ordered a Hidden-Hitch #31824 POWERLINE SMART POWER CONVERTER. This uses separate power for the trailer lights, and signals from the stop and turn signals on the car just for on-board relay activation. It keeps the bulb failure light off.
I used the existing green wire to the power antenna connector (unused in my 1990 240 sedan) for power, instead of a new dedicated wire from the battery. It tested fine on a 4 x 8 UHaul with the LED lights.
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Jim (90 244DL 170K miles) turbo sways w/poly, front struts & bushings, OD wiring, downpipe.
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