RRSPORT.CO.UK

    Forum   Gallery   Shop   Sponsors
Home > General > Alternator volts when charging.
Post Reply  Down to end
Page 1 of 1
 
Jampot1979



Member Since: 23 Jun 2017
Location: Bedfordshire
Posts: 145

United Kingdom 2008 Range Rover Sport TDV8 HST Java Black
Alternator volts when charging.

Hi

Been having a number of dash errors and faults come up on my RRS. Changed battery and made sure connections were good.

Been ok for a week until today. Didn't want to start, hazards flashing etc. Started after leaving it a while.

I have noticed that when first started, the voltage charge is 14.4volts, but after about 10 minutes of driving, it drops to 13.2v. is this a sign of a tired alternator? Could this explain the many fault messages, etc?

Post #552704 Fri Mar 30 2018 4:34pm
View user's profile Send private message View poster's gallery Reply with quote
Paddi



Member Since: 06 Jul 2012
Location: Hertfordshire
Posts: 1563

United Kingdom 2008 Range Rover Sport TDV8 HSE Java Black

It is normal for the alternator to churn out higher voltage after starting and then regulate down after a while.

How are you measuring the voltage? The most simple accurate way is to put a digital multimeter across the battery terminals. Check the voltage at start up, let it run for few minutes and then switch on some high drain components like the lights and heated seats. If the alternator is good it will be able to keep the volts up at about 14 if you raise the revs a little.

But have you checked the battery with engine off, after standing overnight. I'm wondering if you have something draining the battery. Anything less than about 12.3volts suggests something is wrong. Common culprit is the upper rear hatch switch. 2008 MY Java Black TDV8 HSE

Post #552712 Fri Mar 30 2018 5:28pm
View user's profile Send private message View poster's gallery Reply with quote
Jampot1979



Member Since: 23 Jun 2017
Location: Bedfordshire
Posts: 145

United Kingdom 2008 Range Rover Sport TDV8 HST Java Black

The battery is showing 12.6v before starting.

I have a plug-in voltage reader which goes in the cigarette socket! That's how I am reading voltage.

Post #552715 Fri Mar 30 2018 6:02pm
View user's profile Send private message View poster's gallery Reply with quote
phillh



Member Since: 09 Oct 2016
Location: Hertfordshire
Posts: 198

United Kingdom 2005 Range Rover Sport TDV6 HSE Zermatt Silver

Mine shows around 15v with the engine running which I thought was high but a couple of the experts on here said its perfectly normal.

Post #552717 Fri Mar 30 2018 6:36pm
View user's profile Send private message View poster's gallery Reply with quote
geoffsnook



Member Since: 19 Nov 2016
Location: cardiff
Posts: 1699

Wales 2005 Range Rover Sport Supercharged HSE Java Black

15 is quite normal get a volt meter across the terminals your battery might need a good charge depends how long it was on the shelf Thumbs Up

Post #552722 Fri Mar 30 2018 7:13pm
View user's profile Send private message View poster's gallery Post Reply
Post Reply  Back to top
Page 1 of 1
All times are GMT

Jump to  
Previous Topic | Next Topic >
Posting Rules
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Site Copyright © 2005-2024 Futuranet Ltd & Martin Lewis
RRSPORT.CO.UK RSS Feed - All Forums

Switch to Mobile site