Cluster Instrument Light + tail lights went out

[CDCD]

Howdy, reaching out regarding a 1991 F250 Custom.
The other night the light for the cluster instrument and the tail lights went out.
1. Is this a fuse or a relay? How can I tell if it's a fuse or relay?
2. Is there a good resource for locating parts?

Thanks

 

[Fellro]

No relays, just fuses for the lights. The cover for the fusebox generally tells you which one does what.

 

[oldbeater]

found out my lights were out as I was driving home at night. i had never driven it at night in the week I had it and my son-in-law's house. lots if fun. i think it is the light switch. going to put in two relays for high beam and low beam.

 

[Fellro]

Headlights have a breaker which I believe is integral to the switch.