Hi, I got a 94 Hilux extra cab and all of a sudden today (both times I drove it) my electrical is wigging out. I turn my heater on high and my voltage meter and speedometer dip and my lights dim AND my stereo reboots. What the!?!? Also the same happens if I flip on my turn signal.
Anyone have an idea that can solve this?

 

any one monkey with the dash recently?

 

Better check that alternator. Multiple gauge anomalies and dimming lights are signs of a charging circuit issue. They are absolutely symptoms of a drop in your electrical system's voltage. Might want to go check to see if it will start.

 

Got in the truck this morning and everything was fine. Turn signal on, stereo didn't flinch and gauges didn't dip. Maybe I just left my headlights on the night prior or something. I was suspecting the alternator, but now I'll just keep an eye on things and see if it happens again. Hopefully it "fixed itself."

 

No sir.

 

Don't forget simple things that cost almost nothing- check ALL your connections, at least from battery to fuse block and from battery to ground. Good electrical connections should have bare, shiny metal securely contacting bare, shiny metal.

When I suspected issue with my alternator, I got that plugs into the cigarette lighter socket. (Someday I'll hardwire one in.) Gives you more exact reading than an analog needle gauge. Healthy charging system should have 13.5 to 15.1 volts.

BTW, it would help if you put year-model-engine-transmission of your vehicle in your signature. Helps save time for everybody trying to help.