brake light on when heat is turned on on 1991 Dodge Ram Van B350

If my heat is turned on the brake warning light comes on the blower does not work,if I push a power window button the brake light comes on when I put it in reverse the brake light comes on where do I look? Is this a ground problem?

1 answer
Sounds like an electrical feedback problem. You will have to get a manual to check all for the vehicle wiring grounds. Also, inspect fuses, the bulkhead connectors (under the hood) for moisture, corrosion and loose terminals.