I am installing a arb air compressor and I am having problems locating the dash illumination lights so that I can attach to it.

check the ignition switch for voltage in and out, if the switch fails nothing will run except accessories that work with key off.

Power is supplied to the instrument illumination by the "TAIL/ILLUM LIGHT" fuse, Fuse #4 (15 Amp) located in the dash fuse block under the left side of the dash. This fuse provides power for both the primary and secondary sides of the TAIL LIGHT relay. The Combination (Headlamp) switch provides a ground path for the primary circuit of the TAIL LIGHT relay. When the primary circuit is completed by the Combination switch, the secondary contacts close and provide power to the tail lamps as well as to all of the instrument illumination bulbs. The ground for the instrument illumination bulbs is a variable-resistance circuit which is controlled by the illumination controller. The final ground for both the combination switch and the illumination controller is Ground G302, located under the center console.

this happened 2 me also because the rear air shocks were popped, they are very expensive 2 replace with factory parts, I found aftermarket air shocks for $80 but you need 2 fill them manually and disconnect the compressor . If you want 2 track the lines the compressor is behind the front bumper near the passenger side wheel well from there you can follow the lines 2 the shocks, meanwhile you should disconnect the air compressor it can burn out from running all the time. The factory shocks are close 2 $300 ea. with the aftermarket shocks there with be a valve stem 4 you 2 fill them with and are easy for a do it yourselfer

Antilock rear brake system, You can have this checked but it wasn't much of a system in 89. Most people I know disable it and ignore the light. your brakes still work just fine

Hello
Since you're looking for fuses and relays, I will assume that the compressor is not working. First check the suspension service shut off
switch located under the right side of the dash. If thats on, go to the fuse block under the left side of the dash and check fuses #4-#5-#20-#2
If they're ok, move to the fuse block under the hood on the left fender and check fuse #109 a large 50amp fuse it's best to use a 12v test light.
If that checks out, check the compressor relay located near the right
headlight assy. there will be 4 wires from the relay, lt blue/pink(hot to fuse #109) lt green/red(grnd to compressor) grey/red pwr to compressor)
drk blue/yell to suspension/steering module located behind ctr of dash.
Before you start these tests turn key to on(should be on for all tests)
use the 12v test light and test for power from grey/red wire at the
compressor + check lt grn/red wire for good ground. If you have pwr+grnd it's most likely a bad compressor. But if no power perform the
above tests. Hope this helps.

If you only have a problem with the dash lights on the right side of the dash to the passenger side there is a lid to take off and there are a fuse for the fuse 10 10Amps this is the illumination of the panel. Thansk good luck

I had soved my problem... That was stupid.. The cause is that I tried to connect the (illumination +) and the (illumination -) wires togetter on the dimmer wire of my double din unit. That make a short cut and blow the litening fuse (fuse 13 on passenger side fuse panel). I replaced correctly the wiring, keeping the (illumination +) wire unused. That solve my problem but, however I get back my dash illumination, I can't adjust the lightning level... I thing I have a problem with the level switch.. It don't matter to me but if you get the same problem and solve it, please tell me your solution.

Regards

jerome

Had a similar problem and fixed it by installing a new headlight switch / turn signal lever. Hope this helps.

arb air locker? make sure your getting enough air pressure and no lines kinked