Sl55 2002 red battery light cluster battert drain

[Tylerhayles1]

Hoping for a bit of luck may be a long shot but maybe someone has had the same problems will attach pictures
Getting the k57 battery isolation relay fault
Any ideas on where to start and what to do next, both battery seems to be ok heard alternator could play a part

secondly my cluster is causing a battery drain but cluster seems to function as normal, and have had it “repaired” also tried 2 different clusters and still getting a drain when i pull fuse 22 driver side 5amp the drain goes away
When I plug in the scanner its not even reading the cluster part number so kind of aint even recognising its on the system
Someone please help, finally getting to the end of the sl probably and these are doing my head in

 

[mioba]

do you know how to use a miltimeter to test the alternator, do that first.
Ditch the computer and fault reader as its not helping you

 

[Tylerhayles1]

do you know how to use a miltimeter to test the alternator, do that first.
Ditch the computer and fault reader as its not helping you

yeah i can do a test , what isit im exactly looking for figure wise on this?
I hear they are very specific on alternator and regulators, otherwise can throw up codes

 

[mioba]

engine running, vm across the terminals, should be getting about 13.4- 13.8v.

ie, should go up when engine running