Izusu trooper 1990 tail lights problems
 

Izusu trooper tail lights license number lights and brake lights are not working only blinkers work any suggestions?

The first thing I would do just as matter of course would be to review the circuit diagrams for the three different pairs of lights.

Then check the fuse or fuses in the fuse box for those lights. Your problem wouldn't derive from the flasher switch, since the flashers (blinkers) are working fine.

I'd find it odd that your parking (tail lights?) license number and brake lights are all not functioning, but it would be easily explained if they used the same fuse.

I'm personally replacing all of my #1156 and #1157 parking/backup/stop/turn-signal/hazard lights with LED 1156 and 1157 equivalents on my 95 Trooper. No complications with it except for the blinker lights governed by the flasher switch and a condition known as "hyper-flashing". The solution to that is to install Sylvania LED Equalizer (resistors) for the four bulbs in the turn-signal/hazard circuit. Extra complication in that the resistors have heat sinks which can get hot and melt plastic, so the solution is to use thermal epoxy to mount them on body metal. A lot of unnecessary trouble to change into LED technology.

If you never bothered to acquire the shop manual (source of the circuit diagrams), there may be a PDF version you can download. Mine cost me about $15. The printed manual had cost me $100, and is very unwieldy for its 2,000 pages.

Also, see if there is a relay switch which controls all of those lights. The flashers have their own relay.

Airis Airis:

I was just getting ready to go to my garage and install the LED resistors/equalizers that I mentioned, and I wanted to check the circuit diagrams once more. That is, I KNOW how the signal light is color-coded, but I wanted to get the code for the parking light that uses the same bulb. I see that the license light, "tail light", parking light and side marker lights are all connected to the same ground, relay switch and probably -- fuse.

I suppose I'd look at the fuse first, as I already said. Yours is a 1990 -- mine a 1995. But I'd think they would share similar wiring diagrams.