91 caprice headlight relay location???

Where is the relay located? I have power from my switch and haven't messed with dimmer switch yet. Any help would be appreciated.

Relay? AFAIK, unless this is a 9C1 with the typical butchering of the electrical system, there is no relay. The only thing between the headlight switch and the lamps themselves on a regular Caprice is the dimmer switch and some copper. The yellow wire to the dimmer switch should have power from the light switch. Tan at the dimmer is low beam, and light green is high beam. If you have power there but not at the lamp sockets, check the C200 (bulkhead) connector at the firewall. If you have power at the lamp sockets, look at bulbs, sockets, and grounds.