So I found this information on how to fix the charge light relay on a Toyota Supra/Celica forum. The 80s models Celica’s basically had the same charging system as first gen Hilux (in regards to the Relay). It takes about 35-60 minutes (depending how far the trip to Radio Shack is) and about $1.00
I have upgraded my Alternator with a 1987 Toyota 70 amp ALT, other than that my charge system is stock. I highly recommend up-grading your alternator with a 2nd Gen Alternator. Its a pretty basic electrical modification.
Step 1:
go to your local electronics supply and get a Rectifier diode 50v (RadioShack PN 276-1101)
Step 2:
Bend the leads and crimp on some quick connect male terminals (whatever they are called)
Step 3:
The Rectifier Diode has a silver stripe, that end will go into the upper right side of the relay socket. (in the picture its labeled B)
Step 4:
The black or Un-striped side will go into the Upper Left side of the relay socket (in the picture its labeled A)
Step 5:
Toss your old Charge light relay aside
Step 6:
Enjoy the fruits of your Labor, revel in your triumph and glory, say goodbye to your evil charge light and hello to your happy once again functioning E-Brake light that will now go off now when you release your e-brake!!!!!!!
I put shrink tubing on mine just for a little protection.
I have the stock SR5 Ammeter to show me if my system is not charging. Im not sure if this modification will completely override the charge light warning circuit. But I believe it will still function properly.
In other words.... you should get an Ammeter installed if you don't already have one.