Can i use a 1992 voltage regulator in a 1990 toyota hilux ute

SOURCE: 1990 dodge caravan voltage regulator location

The Voltage regulator is in the PCM.

SOURCE: Voltage regulator on 1985 Toyota Supra

It's built in the alternator.

SOURCE: Voltage Regulator

inside the alternator. look at the back of alt and where the wires go to inside.

SOURCE: what doe's it mean when a T belt light on dash

I believe it means timing belt. Hope that solves your problem.

SOURCE: How to change the alternator

Its not very difficult to replace alternator, just few bolts needs to be taken out and alternator can be removed out.For complete procedure with more details , click the link below :--- http://howtobyme.blogspot.com/2011/08/how-to-remove-alternator-on-toyota.html ----------- This will help.Thanks.Helpmech.