Emmenay
Free Member
- Dec 11, 2011
- 505
- 481
- Funster No
- 19,163
- MH
- Swift Kon-tiki 600
- Exp
- Since 2011
On a journey to Spain very recently I noticed that the habitation batteries and the engine battery were reading less than usual voltage on the control panel after every journey whether it had done 10 miles or 400 miles. The most it was reading was 12.4 volts when settled. Previously it has measured a comfortable 12.8v so I put it down to lots of air con etc. throughout spain.
Now that I have returned home I have been able to show it the voltmeter this morning, (should have taken it with me I know oh. What I have found is this;
The engine battery voltage at rest was 12.5 volts, as were both the hab batteries. Once started, the engine battery was reading 14.4v, with the hab batteries reading 13.4v after a little while.
Now the interesting bit, I turned the air con on which was usual in spain, then the hadlamps and wipers, the voltage dropped to 12.6v and very slowly kept dropping until it got to 12.4v, at which point I got fed up!
Now I must point out that all of my batteries are new this year so I think I can eliminate them, and this has been the first time I have needed the air con for any distance as well as frequent use of headlamps for evening driving.
Does this sound like the alternator is on its last legs or am I barking up the wrong tree?
Now that I have returned home I have been able to show it the voltmeter this morning, (should have taken it with me I know oh. What I have found is this;
The engine battery voltage at rest was 12.5 volts, as were both the hab batteries. Once started, the engine battery was reading 14.4v, with the hab batteries reading 13.4v after a little while.
Now the interesting bit, I turned the air con on which was usual in spain, then the hadlamps and wipers, the voltage dropped to 12.6v and very slowly kept dropping until it got to 12.4v, at which point I got fed up!
Now I must point out that all of my batteries are new this year so I think I can eliminate them, and this has been the first time I have needed the air con for any distance as well as frequent use of headlamps for evening driving.
Does this sound like the alternator is on its last legs or am I barking up the wrong tree?