Nissan 370Z Forum  

Voltage drop at stops!

Was wondering if anyone can help me, my car drops volt at stops and red lights. Have a new battery and alternator. After the new alternator was installed the problem

Go Back   Nissan 370Z Forum > Tech Area > Nissan 370Z Warranty / Scheduled Maintenance / Servicing / Repairs

Like Tree1Likes

Reply
 
LinkBack Thread Tools Display Modes
Old 01-08-2019, 11:21 AM   #1 (permalink)
Track Member
 
Rogue Z's Avatar
 
Join Date: May 2009
Location: Los Angeles
Posts: 559
Drives: 2009 Silver MT 370Z
Rep Power: 12
Rogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud of
Default Voltage drop at stops!

Was wondering if anyone can help me, my car drops volt at stops and red lights. Have a new battery and alternator. After the new alternator was installed the problem continued but now, my pioneer unit turns on and shuts off. Could it be a radio thing?
__________________
Rogue Z is offline   Reply With Quote
Old 01-08-2019, 11:27 AM   #2 (permalink)
Base Member
 
Join Date: Aug 2018
Location: Ct
Age: 54
Posts: 35
Drives: 2018 nismo tec
Rep Power: 1
Jv01jv01 is on a distinguished road
Default

Get a volt meter check across battery terminal + and- See what the voltage reads
Jv01jv01 is offline   Reply With Quote
Old 01-08-2019, 11:33 AM   #3 (permalink)
Base Member
 
Join Date: Aug 2018
Location: Ct
Age: 54
Posts: 35
Drives: 2018 nismo tec
Rep Power: 1
Jv01jv01 is on a distinguished road
Default

Get a volt meter check across battery terminal + and- See what the voltage reads . There are 6 cells in batt. 2.2 volts per cell so you should have 13.2 volts when not running give or take. Start car read voltage should be over 14 volts or so. If you don’t have a meter that have battery tester at harbor freight or go to auto parts store should be able to test you’re battery and alt
Jv01jv01 is offline   Reply With Quote
Old 01-08-2019, 12:07 PM   #4 (permalink)
A True Z Fanatic
 
SouthArk370Z's Avatar
 
Join Date: Nov 2010
Location: South Arkansas
Posts: 7,277
Drives: 2014 Challenger
Rep Power: 11476
SouthArk370Z has a reputation beyond reputeSouthArk370Z has a reputation beyond reputeSouthArk370Z has a reputation beyond reputeSouthArk370Z has a reputation beyond reputeSouthArk370Z has a reputation beyond reputeSouthArk370Z has a reputation beyond reputeSouthArk370Z has a reputation beyond reputeSouthArk370Z has a reputation beyond reputeSouthArk370Z has a reputation beyond reputeSouthArk370Z has a reputation beyond reputeSouthArk370Z has a reputation beyond repute
Default

How low do the volts go? Is the Pioneer thumping or at low volume when the problem occurs? Have you checked the condition of the battery terminals? What effect does turning the headlights on have?
__________________
Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub
Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma
SouthArk370Z is offline   Reply With Quote
Old 01-08-2019, 01:25 PM   #5 (permalink)
Track Member
 
Rogue Z's Avatar
 
Join Date: May 2009
Location: Los Angeles
Posts: 559
Drives: 2009 Silver MT 370Z
Rep Power: 12
Rogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud of
Default

When the car starts it's over 14... as I drive it its a hair over 14 then drops to 12-12.5 at stops.. the pioneer splash screen turns on but then goes black.. doesnt work.. was thinking of pulling the unit out. The headlights have no effect on the car...however if I turn the a/c on, headlights, and all the lights on in the car I do see the volts moving a little at 14. The battery terminals are clean.
__________________
Rogue Z is offline   Reply With Quote
Old 01-08-2019, 02:08 PM   #6 (permalink)
Rated Z
 
JARblue's Avatar
 
Join Date: Mar 2011
Location: Austin, TX
Age: 38
Posts: 28,897
Drives: 2011 370Z Sport MT
Rep Power: 1643985
JARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond repute
Default

Did the voltage issue start before or after the headunit install?
__________________

2011 370Z 6MT Sport Gun Metallic | R2C | FI | Z1 | RJM | TWM | EcuTek | ZSpeed | EVO-R | GT Mat | Custom Z Fog Light | Custom Z Start Button
JARblue is offline   Reply With Quote
Old 01-08-2019, 05:55 PM   #7 (permalink)
Track Member
 
Rogue Z's Avatar
 
Join Date: May 2009
Location: Los Angeles
Posts: 559
Drives: 2009 Silver MT 370Z
Rep Power: 12
Rogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud of
Default

Way after, pulled radio fuse, power socket out and problems continued. Engine off battery volt was at 12.3 and with it on read at 14
__________________
Rogue Z is offline   Reply With Quote
Old 01-09-2019, 12:33 AM   #8 (permalink)
Rated Z
 
JARblue's Avatar
 
Join Date: Mar 2011
Location: Austin, TX
Age: 38
Posts: 28,897
Drives: 2011 370Z Sport MT
Rep Power: 1643985
JARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond reputeJARblue has a reputation beyond repute
Default

What is way after? Weeks? Months? Years? Electrical gremlins are no fun to track down. But I've seen them show up due to an improperly installed electrical component more than 6 weeks after the install. Weird shít happens...

Voltage readings seem normal a bit low (*edited as apparently I'm dyslexic and read 12.3 as 13.2).
__________________

2011 370Z 6MT Sport Gun Metallic | R2C | FI | Z1 | RJM | TWM | EcuTek | ZSpeed | EVO-R | GT Mat | Custom Z Fog Light | Custom Z Start Button

Last edited by JARblue; 01-09-2019 at 11:10 AM.
JARblue is offline   Reply With Quote
Old 01-09-2019, 05:26 AM   #9 (permalink)
Base Member
 
Join Date: Aug 2018
Location: Ct
Age: 54
Posts: 35
Drives: 2018 nismo tec
Rep Power: 1
Jv01jv01 is on a distinguished road
Default

12.3 is low Do easy stuff first go to auto parts store they have machine to load test battery, if you have a bad cell in batt It will give you fits. New bat can be bad. If alternator is charging bad batt you just waste time my car has been sitting all week . I have 12.56 volts. 13.2 is normal. Kiss > >>kept it simple. It’s a 12 volt system if batt goes below 12 v. Stuff won’t work right. So I just checked my car running it’s charging at 14.61. Or go back to who put alt in have them check operation

Last edited by Jv01jv01; 01-10-2019 at 02:38 AM.
Jv01jv01 is offline   Reply With Quote
Old 01-09-2019, 11:05 AM   #10 (permalink)
Track Member
 
Rogue Z's Avatar
 
Join Date: May 2009
Location: Los Angeles
Posts: 559
Drives: 2009 Silver MT 370Z
Rep Power: 12
Rogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud of
Default

Yea I had amplified in so cal do the install back in 2010. But i ended up pulling and fuses and checking the drop yesterday. Then tried pulling the intake sensor off waiting for check engine light and clearing the code( another person on this forum did that). Then came across a voltage regulator? Never felt with a voltage regulator...anyone mess with that before?
__________________
Rogue Z is offline   Reply With Quote
Old 01-10-2019, 07:25 PM   #11 (permalink)
Track Member
 
Rogue Z's Avatar
 
Join Date: May 2009
Location: Los Angeles
Posts: 559
Drives: 2009 Silver MT 370Z
Rep Power: 12
Rogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud of
Default

Damn, today my car started then shut down... twice!. The 3rd time I started it and gave it gas before it could shut down... this car is tripping me out!
__________________
Rogue Z is offline   Reply With Quote
Old 01-16-2019, 03:15 PM   #12 (permalink)
Track Member
 
Rogue Z's Avatar
 
Join Date: May 2009
Location: Los Angeles
Posts: 559
Drives: 2009 Silver MT 370Z
Rep Power: 12
Rogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud of
Default

Just paid $130 for a diagnosis at Fontana Nissan for them to tell me nothing is wrong with the car. Clearly there is.. "it's not throwing a code". I could've told you that. It's normal for volt to drop when there is a load on the car. ... Save your money and dont take it to Nissan!
__________________
Rogue Z is offline   Reply With Quote
Old 02-10-2019, 03:18 PM   #13 (permalink)
Base Member
 
Join Date: Nov 2015
Location: toronto, canada
Posts: 89
Drives: 2016, 370z
Rep Power: 4
stansens is on a distinguished road
Default

Just a thought. Does the car have an undersized crank pulley which would not allow the alternator to turn fast enough at idle speeds? Next is to make sure the wiring to the alternator is perfectly clean, tight nut on output terminal and damage free regulator connector. Battery terminals must be clean and tight. Try to twist the battery connections once tightened.
Also North American batteries have smaller diameter posts compared to Japanese batteries which means you may have to install post shims... $5.00 aND 5 minutes work.
Lastly wiggle wires and connections at battery and battery main fuse unit and alternator to see if voltage fluctuates. Can't think of much else without seeing it. Hope that helps.
stansens is offline   Reply With Quote
Old 02-11-2019, 10:26 AM   #14 (permalink)
Track Member
 
Rogue Z's Avatar
 
Join Date: May 2009
Location: Los Angeles
Posts: 559
Drives: 2009 Silver MT 370Z
Rep Power: 12
Rogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud ofRogue Z has much to be proud of
Default

No, the pulley is stock. The only thing tha has been changed is the alternator and battery. I think the wiring to the alternator is clean since they checked it at Fontana Nissan. I'll try to wiggle wires and see what happens but the connection was tight last time I check.
__________________
Rogue Z is offline   Reply With Quote
Old 02-11-2019, 09:58 PM   #15 (permalink)
Track Member
 
Join Date: Oct 2014
Location: socal
Posts: 861
Drives: 370z
Rep Power: 6
nis350 is just really nicenis350 is just really nicenis350 is just really nicenis350 is just really nicenis350 is just really nice
Default

is it an OEM alternator or one from pepboys etc?

those rebuilt ones from the auto stores can be problematic.

a good alternator should supply enough juice to support all the OEM accessories when the engine is running, you can actually remove the battery and the car would run fine.



Quote:
Originally Posted by Rogue Z View Post
Was wondering if anyone can help me, my car drops volt at stops and red lights. Have a new battery and alternator. After the new alternator was installed the problem continued but now, my pioneer unit turns on and shuts off. Could it be a radio thing?
nis350 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Front bump stops pics? Ni55anPat Brakes & Suspension 0 10-17-2012 09:38 PM
tach works, then stops on my 96 300zx tt ernie Other Vehicles 8 08-07-2012 01:47 PM
The Red Sox pulling all the stops!!! PapoZalsa Sports 0 12-09-2010 06:06 PM
1,400 miles and now odometer stops working? SlowNCurious Nissan 370Z Warranty / Scheduled Maintenance / Servicing / Repairs 8 11-27-2010 12:19 PM
Lexus LFA Stops by Forged Performance. Tray@Forged Other Vehicles 29 09-23-2010 10:31 PM


All times are GMT -5. The time now is 05:40 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 PL2