It is possible that the taillight wiring on your 1998 Chevy Astro has more than one wire that carries the turn signal functions. If so, and you connected the wiring harness # HM41225 to those, then the brake light signal would not get to the 4-Way. You can double check the factory wires using a circuit tester such as # PTW2993 or a meter if you have one. Have someone sit in the vehicle and operate the brakes while you test the wires.
If everything is wired up correctly on the vehicle side... view full answer...
First, the correct wiring harness for a 2001 Chevy Astro is # 18252. This harness splices directly into the tail light wiring of the van. The brake lights and turn signals are on the same circuit. Check to see if the brake lights on the van are working. If they are then the most likely issue is a bad ground connection or a dirty/corroded trailer connector.
Ground issues normally show up when there is more load on a system such as the constant 12 volt draw of the brake lights. You will... view full answer...
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