Correct Wires on a 1991 Ford Aerostar to Install Hopkins Vehicle Wiring Converter # HM48915

Expert Reply:

In order to find the correct wires for installation of the Hopkins Vehicle Wiring Converter, # HM48915, you will need a circuit tester like # 3808. This wiring harness is designed for use on vehicles that have amber or independent bulb turn signals which should be what is on your 1991 Ford Aerostar.

First, ground the white wire to a bare metal surface. Next, using the circuit tester, probe the wires behind the driver side tail light until you find the one that carries a constant signal when the running lights are on. Connect this wire to the brown wire on the harness. Then find the wire that provides a signal when the brakes are applied and attach it to the red wire. Then, engage the left turn signal and find the wire that carries a signal in unison with the blinker and attach it to the yellow wire.

Route the green wire to the passenger side tail light. Find the wire that carries a signal in unison with the right turn signal engaged and attache it to the green wire. Reassemble everything and installation is complete.

expert reply by: Michael H