Voltage problem consumers off
Thread Starter
Newbie
Joined: Aug 2006
Posts: 11
Likes: 0
Voltage problem consumers off
My 2003 E500 73,000 miles
is getting the battery warning message at times and is getting more frequent.
Dash lights are pulsing in brightness so I checked voltage at the main batery.
Found it varing 13.4 to 14.8 at idle.
I guess it is an alternator or voltage regulator problem.
How can I determine which one?
Is VR on the alternator like on most US cars or a seperate unit.
what is the location ?
Thanks for any help on this I hate to send it to MB it is allways so costly.
is getting the battery warning message at times and is getting more frequent.
Dash lights are pulsing in brightness so I checked voltage at the main batery.
Found it varing 13.4 to 14.8 at idle.
I guess it is an alternator or voltage regulator problem.
How can I determine which one?
Is VR on the alternator like on most US cars or a seperate unit.
what is the location ?
Thanks for any help on this I hate to send it to MB it is allways so costly.
MBWorld Fanatic!
Joined: Mar 2006
Posts: 3,254
Likes: 15
From: Louisiana
03 E500 and Corvette
My 2003 E500 73,000 miles
is getting the battery warning message at times and is getting more frequent.
Dash lights are pulsing in brightness so I checked voltage at the main batery.
Found it varing 13.4 to 14.8 at idle.
I guess it is an alternator or voltage regulator problem.
How can I determine which one?
Is VR on the alternator like on most US cars or a seperate unit.
what is the location ?
Thanks for any help on this I hate to send it to MB it is allways so costly.
is getting the battery warning message at times and is getting more frequent.
Dash lights are pulsing in brightness so I checked voltage at the main batery.
Found it varing 13.4 to 14.8 at idle.
I guess it is an alternator or voltage regulator problem.
How can I determine which one?
Is VR on the alternator like on most US cars or a seperate unit.
what is the location ?
Thanks for any help on this I hate to send it to MB it is allways so costly.
Thread Starter
Newbie
Joined: Aug 2006
Posts: 11
Likes: 0
Battery was replaced about a year ago.
Problem is present regardless of electrical load.
It was very intermittent but becoming more frequent.
Batt Voltage after sitting all night is still 12.4V so don't think batt is weak or not holding a charge.
I also replaced the AUX batt just because it was old but it still had a good reading.
Problem is present regardless of electrical load.
It was very intermittent but becoming more frequent.
Batt Voltage after sitting all night is still 12.4V so don't think batt is weak or not holding a charge.
I also replaced the AUX batt just because it was old but it still had a good reading.
MBWorld Fanatic!
Joined: Mar 2006
Posts: 3,254
Likes: 15
From: Louisiana
03 E500 and Corvette
1) Verify the alternator is charging.
If it is charging.
2) The battery modules that could also cause this located in the trunk by the main battery.
See attached.
3) Power seat relay under driver seat can also cause parasite power loss.
Don't underestimate that a new battery doesn't mean it is a 'good' battery. Check the 'new' battery and verify it is good.
If it is charging.
2) The battery modules that could also cause this located in the trunk by the main battery.
See attached.
3) Power seat relay under driver seat can also cause parasite power loss.
Don't underestimate that a new battery doesn't mean it is a 'good' battery. Check the 'new' battery and verify it is good.
MBWorld Fanatic!
Joined: Mar 2006
Posts: 3,254
Likes: 15
From: Louisiana
03 E500 and Corvette
The module is not the regulator. The module is control as you have dual batteries. I have the tech details in the sevice manual.
Send me your PM and I will email you my adobe file with the information.
Send me your PM and I will email you my adobe file with the information.
