Aux Battery Relay
Thread Starter
Junior Member
Joined: Apr 2018
Posts: 45
Likes: 1
From: Brownsburg-Chatham
2003 E500
Aux Battery Relay
Hey guys,
I’ve recently got the red battery message on the dash. I tested the aux battery and it had low charge (50%), so figured that was the issue. I replaced it and am still getting the message with the “consumer power” message as well. It would seem that it is likely the relay (based on what I’ve read here). Does anyone have one for sale or anyone have any contacts? The dealership does not have any in stock, I see some on ebay, but I don’t have much confidence in that platform anymore.
If I buy used, does it matter if the donor car is a right hand drive (my car is left hand).
this is for a 2003 E500
Thanks
Mike
I’ve recently got the red battery message on the dash. I tested the aux battery and it had low charge (50%), so figured that was the issue. I replaced it and am still getting the message with the “consumer power” message as well. It would seem that it is likely the relay (based on what I’ve read here). Does anyone have one for sale or anyone have any contacts? The dealership does not have any in stock, I see some on ebay, but I don’t have much confidence in that platform anymore.
If I buy used, does it matter if the donor car is a right hand drive (my car is left hand).
this is for a 2003 E500
Thanks
Mike
Newbie
Joined: Jul 2019
Posts: 3
Likes: 0
05 E320 wagon
Hey guys,
I’ve recently got the red battery message on the dash. I tested the aux battery and it had low charge (50%), so figured that was the issue. I replaced it and am still getting the message with the “consumer power” message as well. It would seem that it is likely the relay (based on what I’ve read here). Does anyone have one for sale or anyone have any contacts? The dealership does not have any in stock, I see some on ebay, but I don’t have much confidence in that platform anymore.
If I buy used, does it matter if the donor car is a right hand drive (my car is left hand).
this is for a 2003 E500
Thanks
Mike
I’ve recently got the red battery message on the dash. I tested the aux battery and it had low charge (50%), so figured that was the issue. I replaced it and am still getting the message with the “consumer power” message as well. It would seem that it is likely the relay (based on what I’ve read here). Does anyone have one for sale or anyone have any contacts? The dealership does not have any in stock, I see some on ebay, but I don’t have much confidence in that platform anymore.
If I buy used, does it matter if the donor car is a right hand drive (my car is left hand).
this is for a 2003 E500
Thanks
Mike
Thread Starter
Junior Member
Joined: Apr 2018
Posts: 45
Likes: 1
From: Brownsburg-Chatham
2003 E500
Thread Starter
Junior Member
Joined: Apr 2018
Posts: 45
Likes: 1
From: Brownsburg-Chatham
2003 E500
Alright so after being in the garage since this issue came up and had the alternator changed (along with many misc parts that I had been waiting to take care of), the red “visit workshop” message is still there. So I’ve just ordered what I had originally suspected to be the problem based on what I’ve read here - the aux battery relay. I should have it in a couple days and will update!
Thread Starter
Junior Member
Joined: Apr 2018
Posts: 45
Likes: 1
From: Brownsburg-Chatham
2003 E500
Alright so after being in the garage since this issue came up and had the alternator changed (along with many misc parts that I had been waiting to take care of), the red “visit workshop” message is still there. So I’ve just ordered what I had originally suspected to be the problem based on what I’ve read here - the aux battery relay. I should have it in a couple days and will update!
New and old relay.
Installed new relay.
Hey guys,
installed the new relay. I’m still getting the red battery message. Any other ideas? The rear battery is good, front battery is new, relay changed, alternator changed. Any ideas?
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Out Of Control!!
Joined: Jul 2003
Posts: 15,901
Likes: 4,634
From: North Scottsdale, AZ
'71 Pinto
Consider BCM, read through attachment to better understand the system and I would suggest you have someone pull fault codes using MB diagnostics before proceeding.
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Thread Starter
Junior Member
Joined: Apr 2018
Posts: 45
Likes: 1
From: Brownsburg-Chatham
2003 E500
Thread Starter
Junior Member
Joined: Apr 2018
Posts: 45
Likes: 1
From: Brownsburg-Chatham
2003 E500
i ended up pulling a SBC pump and seat module (mind has not worked since I got the car) - will get that in there too!
any way to test the SBC pump? This one kind of has a tank on it - different then the one on my car - newer version maybe?
