Left side of the dash.
The Oil Pressure Switch is located on the driver's side top rear of the engine on your Chevy Pickup.
For flashing headlights just put a new one in.
The headlights do not have a fuse, they have a circuit breaker that is built into the headlight switch.
Usually located on the transmission.
It is located just above the brake pedal pad.
Yes.
it was mid 70s to late silverados
There is no fuse for the headlights in that truck. The circuit is protected by a circuit breaker located inside the headlight switch.
No it does not. Chevy did not use them in that year on there trucks.
NO. it does not.
The 1989 Chevy Silverado pickup truck window wiper relay switch can be found on the firewall in the engine compartment. The relay switch will be on the passenger side of the firewall.
old lights, blowen fuse, shorted wire?