[Firehawk05]

1995 4Runner 3.0 V6

My grandparents said it was running rough and the wipers wouldn't shut off, so I go to check it out.

Turn the key: nothing. Hook up jumper cables and jump start it, it fires up fine and the wipers are off. AS SOON as I disconnect the negative jumper cable from ground, it starts running rough and the wipers start at full speed. Reconnect jumper cable to ground, it goes back to normal.

What's the deal? They said the alternator was replaced last year. I looked at the gauge and the battery gauge is pegged past 18. Voltage regulator issues?

Thanks for any advice.

 

[fourwd1]

Not sure what your problem is, but don't believe the voltage gauge.
The stock gauge is very inaccurate, always read high.

And bonus points to you for knowing how to spell gauge. :clap::clap::clap::clap:

 

[fourwd1]

Oh yeah, the voltage reg is built into the alt for those years.
Earlier ones have an external V reg.

 

[coontai]

check battery and ground connections for corrosion, but i would put my money that the alternatoris bad. was it a new one or a 'spray and pray.' its not unusual for a rebuilt alterantor to give out after a year. Good luck