Awhile back I was having some issues with the speedometer on my 93 4Runner. It would only work intermittently. After some time I started seeing another problem, with the truck unexpectedly losing all power while driving. I suspected a bad alternator, had it tested, and it did come back as bad. So I replaced the alternator, which DID seem to fix the intermittent speedometer issue.

I was hoping the new alternator would also fix the random loss of power issue, but unfortunately that does not seem to be the case. But from doing a bit of driving and experimenting in the driveway, it seems to me to be some kind of electrical issue. The loss of power seems to be triggered by turning things on and off. So things like the hazards, turn signal, or headlights. It doesn't happen every time, but that always seems to be the trigger.

I'm a bit clueless when it comes to electrical stuff, so any help would be much appreciated! Thanks!

 

Wipers don't seem to affect it at all. So I'm guessing it is something related to the wiring of the lights?

 

Possibly sounds like a loose connection, battery good? all grounds good? I have seen bad batteries do really weird things when they are kinda good but have some bad cells. Headlights are a higher draw than most if you still have halogen's which will make the problem show itself. Just a couple simple things to check

 

Lights are all original halogen. Battery was checked when I replaced the alternator and tested good.

What grounds would I need to check, and where would I find them, and how do I determine whether or not they're good? Again, I'm not too knowledgeable on electric stuff...

 

22re: https://www.yotatech.com/forums/f116...-guide-194413/

The 3.0 I’m not familiar I’m sure someone will chime in with info or other possibilities.