User Tag List

Reply
 
Thread Tools Rate Thread Display Modes
Old 06-18-2019, 08:57 PM #1
KCscout KCscout is offline
Junior Member
 
Join Date: Nov 2014
Location: Omaha, NE; Kansas City, KS
Posts: 9
KCscout is on a distinguished road
KCscout KCscout is offline
Junior Member
 
Join Date: Nov 2014
Location: Omaha, NE; Kansas City, KS
Posts: 9
KCscout is on a distinguished road
Bad voltage regulator on new alternator?

Replaced my alternator, the old one whined for a few weeks and then finally died. Started up my 4runner and everything was good for a little while. I now have surges of voltage and i can feel the alternator putting a load on the engine during surges. All my connections are tight. I even ran a ground from the alternator to the battery ground to eliminate a bad ground. Voltage is either low at 11v or has spiked to 17v. Ill attach a few pictures of voltages i have. Anyone have any extra troubleshooting tips before I replace the alternator again?

Sent from my SM-N920V using Tapatalk
KCscout is offline   Reply With QuoteReply With Quote
Old 06-18-2019, 09:08 PM #2
KCscout KCscout is offline
Junior Member
 
Join Date: Nov 2014
Location: Omaha, NE; Kansas City, KS
Posts: 9
KCscout is on a distinguished road
KCscout KCscout is offline
Junior Member
 
Join Date: Nov 2014
Location: Omaha, NE; Kansas City, KS
Posts: 9
KCscout is on a distinguished road
And for reference this is what the voltage looks like when its not surging.

Sent from my SM-N920V using Tapatalk
KCscout is offline   Reply With QuoteReply With Quote
Old 06-19-2019, 12:15 AM #3
81runner's Avatar
81runner 81runner is offline
Member
 
Join Date: Mar 2018
Location: Moorpark CA
Age: 42
Posts: 479
Real Name: Elliott
81runner has a spectacular aura about 81runner has a spectacular aura about
81runner 81runner is offline
Member
81runner's Avatar
 
Join Date: Mar 2018
Location: Moorpark CA
Age: 42
Posts: 479
Real Name: Elliott
81runner has a spectacular aura about 81runner has a spectacular aura about
What kind of alternator did you get? I had serious trouble with rebuilt alternators, wound up getting a fresh denso unit. Been fine ever since
__________________
2007 SR5 V6 4WD 205k, Titanium Metallic. 5100s, OME 885/895, extended rear links, ST Maxx 255/75 R17 on 17x8s, mud flap delete,TB spacer, Spectre CAI, DRL delete, HCF delete, DAC delete, K&N cabin filter, TPMS bypass, Fog light mod, USB galore, dash cam, LED lights all over, rear bumper lights, cbi ditch light brackets w/lights, atrac off, OBA w/2 gallon tank/hidden hook up, Trailgear welded sliders, Rocksteady skids, custom swing-out, 3⁰, SE hood w/working vent, Sprint booster, JET MAF, Kenwood TM-V71a w/motorized antenna, custom dual battery, custom roof rack/lights, custom TRED mount, external 12v, rear diff breather, pck, Freedom UCAs, custom stereo, Aluminum rad, trans cooler, 240A alternator...for now...
81runner is offline   Reply With QuoteReply With Quote
Old 06-19-2019, 12:25 AM #4
Toyrundrive Toyrundrive is offline
Member
 
Join Date: Apr 2019
Location: Earth
Posts: 75
Toyrundrive is on a distinguished road
Toyrundrive Toyrundrive is offline
Member
 
Join Date: Apr 2019
Location: Earth
Posts: 75
Toyrundrive is on a distinguished road
I'm running a mechman alternator monitored by an analog voltmeter. It too about two weeks of occasional City driving for it to even out. Unfortunately the shop that installed it for me (id have done it myself but my steering pump exploded and that pulley is in the way of the last alternator bolt on the V8) decided to put the larger, stock pulley on it without my consent so that could have something to do with it taking so long to even out.
Toyrundrive is offline   Reply With QuoteReply With Quote
Old 06-19-2019, 09:01 AM #5
riceandpho's Avatar
riceandpho riceandpho is offline
Elite Member
 
Join Date: Sep 2005
Location: Oakland CA
Age: 36
Posts: 5,062
riceandpho is a jewel in the rough riceandpho is a jewel in the rough riceandpho is a jewel in the rough riceandpho is a jewel in the rough
riceandpho riceandpho is offline
Elite Member
riceandpho's Avatar
 
Join Date: Sep 2005
Location: Oakland CA
Age: 36
Posts: 5,062
riceandpho is a jewel in the rough riceandpho is a jewel in the rough riceandpho is a jewel in the rough riceandpho is a jewel in the rough
Quote:
Originally Posted by Toyrundrive View Post
I'm running a mechman alternator monitored by an analog voltmeter. It too about two weeks of occasional City driving for it to even out. Unfortunately the shop that installed it for me (id have done it myself but my steering pump exploded and that pulley is in the way of the last alternator bolt on the V8) decided to put the larger, stock pulley on it without my consent so that could have something to do with it taking so long to even out.
when you run a high output alternator, they recommend an inch shorter belt since the pulley is smaller.
__________________
Pioneer DEH-80PRS,Rockford Fosgate T600-2,Hertz ML 1650.3(2 pairs),T400-2,Hertz ML 280.3(2 pairs),T1000-1bdcp,(2)JL Audio 12W6v3, Mechman 240a HO Alternator, Dual Northstar 31m,Borla Dual Exhaust,AFE Magnumforce intake.Enkei WT-4 Michelin Defender LTX 275/55R20. retrofitted S2000 projectors,Philips 85122 White Vision,Morimoto 5Five Ballast.Diode Dynamics SS3 Yellow Fog Sport.2 pairs of Hella Supertones.Full led conversion on interior and exterior.HAWK Talon Rotors and LTS pads F+R,Stoptech stainless steel lines F+R.Bilstein 5100 @0.85, MOOG FJ Springs front,Bilstein B12 36-281824 rear .
riceandpho is offline   Reply With QuoteReply With Quote
Old 06-19-2019, 09:03 AM #6
riceandpho's Avatar
riceandpho riceandpho is offline
Elite Member
 
Join Date: Sep 2005
Location: Oakland CA
Age: 36
Posts: 5,062
riceandpho is a jewel in the rough riceandpho is a jewel in the rough riceandpho is a jewel in the rough riceandpho is a jewel in the rough
riceandpho riceandpho is offline
Elite Member
riceandpho's Avatar
 
Join Date: Sep 2005
Location: Oakland CA
Age: 36
Posts: 5,062
riceandpho is a jewel in the rough riceandpho is a jewel in the rough riceandpho is a jewel in the rough riceandpho is a jewel in the rough
Quote:
Originally Posted by KCscout View Post
Replaced my alternator, the old one whined for a few weeks and then finally died. Started up my 4runner and everything was good for a little while. I now have surges of voltage and i can feel the alternator putting a load on the engine during surges. All my connections are tight. I even ran a ground from the alternator to the battery ground to eliminate a bad ground. Voltage is either low at 11v or has spiked to 17v. Ill attach a few pictures of voltages i have. Anyone have any extra troubleshooting tips before I replace the alternator again?

Sent from my SM-N920V using Tapatalk
i think some guy had the same issue, and it turns out he tore up one of the wire at the 4 pin plug, before you put the battery in, did you charge it up on an external charger to make sure the battery is still good? alot of people dont know that after an alternator swap, having it to try and recharge the old battery can kill it.
__________________
Pioneer DEH-80PRS,Rockford Fosgate T600-2,Hertz ML 1650.3(2 pairs),T400-2,Hertz ML 280.3(2 pairs),T1000-1bdcp,(2)JL Audio 12W6v3, Mechman 240a HO Alternator, Dual Northstar 31m,Borla Dual Exhaust,AFE Magnumforce intake.Enkei WT-4 Michelin Defender LTX 275/55R20. retrofitted S2000 projectors,Philips 85122 White Vision,Morimoto 5Five Ballast.Diode Dynamics SS3 Yellow Fog Sport.2 pairs of Hella Supertones.Full led conversion on interior and exterior.HAWK Talon Rotors and LTS pads F+R,Stoptech stainless steel lines F+R.Bilstein 5100 @0.85, MOOG FJ Springs front,Bilstein B12 36-281824 rear .
riceandpho is offline   Reply With QuoteReply With Quote
Old 06-19-2019, 06:06 PM #7
Toyrundrive Toyrundrive is offline
Member
 
Join Date: Apr 2019
Location: Earth
Posts: 75
Toyrundrive is on a distinguished road
Toyrundrive Toyrundrive is offline
Member
 
Join Date: Apr 2019
Location: Earth
Posts: 75
Toyrundrive is on a distinguished road
Quote:
Originally Posted by riceandpho View Post
when you run a high output alternator, they recommend an inch shorter belt since the pulley is smaller.
I'm aware of that, I told that to the installer, he still swapped the pulleys without even asking. I didn't find out until I was packing up some old parts into my truck for a road trip and saw mechman written on the O'Reilly alternator...
Toyrundrive is offline   Reply With QuoteReply With Quote
Old 06-19-2019, 06:36 PM #8
KCscout KCscout is offline
Junior Member
 
Join Date: Nov 2014
Location: Omaha, NE; Kansas City, KS
Posts: 9
KCscout is on a distinguished road
KCscout KCscout is offline
Junior Member
 
Join Date: Nov 2014
Location: Omaha, NE; Kansas City, KS
Posts: 9
KCscout is on a distinguished road
Quote:
Originally Posted by riceandpho View Post
i think some guy had the same issue, and it turns out he tore up one of the wire at the 4 pin plug, before you put the battery in, did you charge it up on an external charger to make sure the battery is still good? alot of people dont know that after an alternator swap, having it to try and recharge the old battery can kill it.
I believe the alternator plug does not play a role in voltage regulation but I could be wrong. I was under the impression that plug is responsible for turning the dash light on for the battery. Also i put the battery in at 12.6 volts, so no problems there. I'm going to replace my alternator tomorrow and I will update if the problem goes away for anyone browsing with the same problem. Also had some spikes over 20v and a few burned out bulbs. Fairly sure the internal voltage regulator on the alternator is to blame.

Sent from my SM-N920V using Tapatalk
KCscout is offline   Reply With QuoteReply With Quote
Old 06-19-2019, 09:07 PM #9
KCscout KCscout is offline
Junior Member
 
Join Date: Nov 2014
Location: Omaha, NE; Kansas City, KS
Posts: 9
KCscout is on a distinguished road
KCscout KCscout is offline
Junior Member
 
Join Date: Nov 2014
Location: Omaha, NE; Kansas City, KS
Posts: 9
KCscout is on a distinguished road
Quote:
Originally Posted by riceandpho View Post
i think some guy had the same issue, and it turns out he tore up one of the wire at the 4 pin plug, before you put the battery in, did you charge it up on an external charger to make sure the battery is still good? alot of people dont know that after an alternator swap, having it to try and recharge the old battery can kill it.
Turns out I didnt understand how internally regulated alternators worked. You were 100 percent right. Sensing wire apparently didnt have a good connection. I took off the plug and everything looked good. Put the plug back in and pushed it on as hard as i could. Problem seems to be fixed for now. Might have to replace that plug in the future.

Sent from my SM-N920V using Tapatalk
KCscout is offline   Reply With QuoteReply With Quote
Old 06-23-2019, 08:14 PM #10
KCscout KCscout is offline
Junior Member
 
Join Date: Nov 2014
Location: Omaha, NE; Kansas City, KS
Posts: 9
KCscout is on a distinguished road
KCscout KCscout is offline
Junior Member
 
Join Date: Nov 2014
Location: Omaha, NE; Kansas City, KS
Posts: 9
KCscout is on a distinguished road
By chance if anyone sees this that has the same problem, I did end up having to change my alternator out. The problem kept coming back. 2nd new alternator in the 4runner and all my voltage problems have been fixed.

Sent from my SM-N920V using Tapatalk
KCscout is offline   Reply With QuoteReply With Quote
Reply

Tags
alternator , bad , ground , surges , voltage

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Alternator Brush kit, IC regulator, Diode Removal nissanh 3rd gen T4Rs 30 11-16-2023 10:57 AM
Alternator Voltage Question derekl123 4th Gen T4Rs 12 07-09-2020 01:46 PM
Anyone Replace Voltage Regulator in Alternator? Bandit Runner 3rd gen T4Rs 11 12-09-2017 02:04 PM
Voltage regulator upgrade popsmoto 3rd gen T4Rs 4 01-03-2014 12:52 AM
Voltage Regulator on the Alternator Question snowbrdr033 4th Gen T4Rs 3 10-24-2011 08:38 AM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 08:16 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
***This site is an unofficial Toyota site, and is not officially endorsed, supported, authorized by or affiliated with Toyota. All company, product, or service names references in this web site are used for identification purposes only and may be trademarks of their respective owners. The Toyota name, marks, designs and logos, as well as Toyota model names, are registered trademarks of Toyota Motor Corporation***Ad Management plugin by RedTyger
 
Copyright © 2020