I'm trying to fault find the ABS system in my ancient 1994 TS V6.
Light for the ABS used to come on infrequently, then go off by itself.
It is now on permanently.
I've read up and found the ABS can be cactus but the brakes still work well - just no ABS action.
Checked the fluid level in the ABS reservoir, and electrical plugs leading to the ABS unit. All fine.

What to check next?

From memory, so correct me if I am wrong, the sensors are in the hub. Perhaps the sensors need cleaning. Try that first.

I had this issue with a TS V6, the sensors were dirty i think from remembering what the mechanic said

Good idea. Last time I looked at them some were grotty from road dirt and other stuff. Will try that soon. Thanks for the idea.