motor home tail lites

Sometimes... there is an additional fuse panel.

Also though I drive a Workhorse, not a ford... I found one normally fused circuit that quit working, I checked all the fuses, including and particularly the fuse labeled for that circuit.. and found that they had hooked that circuit to a different pin on the block.. one with a defective circuit breaker.

The moral.. It might be a breaker, not a fuse.

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I have seen head light switches that have a built in circuit breaker. Test the light switch.

If you are sure fuses are good, sounds like you need to diagnose your headlight switch. I can pop mine out so I can test voltage with test light. My switch is a rocker type off/PK/HL and it did work loose once on me while I was wiring up lube pump monitor to toad. Maybe yours is just a simple push it back on, but if you bypass switch leads and get marker/dash lights you have found your problem and replace the switch. Use a test light to verify 12v+ then the marker feed. I would start at the switch to make sure you have 12v and test to marker terminal.

Every Ford I have had, the tail lights and dash lights were on the same fuse so when the dash lights went out you would know the tail lights were out also. Learned the hard way. Try replacing the fuses, not just checking them.

Tailights and dash lights are normally on separate fuses.
Check the main fuse block normally located under the hood. There should be large Maxi style fuses that feed the interior fuse block.