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3rd Alternator change and battery and alternator both reading at 17V??!
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i had the voltage reg go bad in a 4runner. voltage would randomly spike and the gauges would go crazy.
my father had a newer 4runner at the time and the alt went bad. took it to a place and they rebuilt it. turns out they didnt change the reg and he had the same issue as before. took it back and they redid the job properly. so i guess hes technically on his 3rd alt lol
what is the V at idle?
what is the V with engine off?
my father had a newer 4runner at the time and the alt went bad. took it to a place and they rebuilt it. turns out they didnt change the reg and he had the same issue as before. took it back and they redid the job properly. so i guess hes technically on his 3rd alt lol
what is the V at idle?
what is the V with engine off?
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I'm getting 17-17.5V off both the alt and battery at idle and with the car off the battery is sitting around 13.5V. I never realized it was common for alts to have bad volt regulators
This thread seems to describe the same issue, with their root cause being the EB2 connector in front of the driver's side fuse panel behind the headlight. one pin in the connector was corroded.
appears to be pin 10 of that connector, which is the ALT-S wire from the battery (through a fuse) to the alternator's voltage regulator.
www.toyotanation.com
It sounds like the voltage regulator is integrated into the alternator but it senses voltage externally (I guess so it can compensate for voltage drop through the cables). If that circuit is disconnected or corroded, maybe it can cause the alternator to lose regulation entirely and severely overcharge the battery.
also check the fuse block for a fuse labeled ALT-S and make sure it is good. you should see battery voltage on both sides of that fuse I believe at all times.
appears to be pin 10 of that connector, which is the ALT-S wire from the battery (through a fuse) to the alternator's voltage regulator.
Voltage High on 2005 Highlander Limited.
Have an urgent issue. My son is going back to college in less than 24 hours. The voltage is running high on his 2005 Highlander 3.3 Limited. (16+ volts from time to time) This has been an off and on again issue for a few months. Original Alternator failed (I think), replaced with a rebuilt...
www.toyotanation.com
It sounds like the voltage regulator is integrated into the alternator but it senses voltage externally (I guess so it can compensate for voltage drop through the cables). If that circuit is disconnected or corroded, maybe it can cause the alternator to lose regulation entirely and severely overcharge the battery.
also check the fuse block for a fuse labeled ALT-S and make sure it is good. you should see battery voltage on both sides of that fuse I believe at all times.
Stick with Denso when it comes to alternators, starters, plugs, AF/O2 sensors....etc. I've read so many threads with issues when people go after market. For whatever reason, Toyota/Lexus doesn't like the aftermarket electrical components. I will stay away from them every time even if it means not having a running vehicle for a few days waiting for Denso parts.
I put an aftermarket starter in my 2002 Camry. It lasted less than 24 months. Original lasted 16 years. I put a Denso in and no problems thus far (2 years). Guy at work has a Yaris and was replacing starters every 2 months, then 2 weeks! He put in a Denso and hasn't had an issue since.
I put an aftermarket starter in my 2002 Camry. It lasted less than 24 months. Original lasted 16 years. I put a Denso in and no problems thus far (2 years). Guy at work has a Yaris and was replacing starters every 2 months, then 2 weeks! He put in a Denso and hasn't had an issue since.
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