The lenses rotate about 5mm then drop off (or you might need to lever them out if they are tight). Have a look at the fuse for the interior lights - does the horn work ? (my 87 has the horn & interior lights on the same fuse)
Check your transfer case knob. If you can move it sideways & it says 'diff lock' then you have the early transfer case. Standard on the 89 is the viscous though.
I'd run relays for those for sure, on the high side at least & you'll probably get a better light on low too with a relay.
The RR wiring won't be what you expect though as each light has it's own circuit & fuse: left high, left low, right high, right low.
You can either fit relays to the RH side & run both headlights from here & leave the LH disconnected or fit relays to both sides. Both sides would be preferable IMO due to the fact that you can lose both sides if a fuse blows.


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