SL/R230 Red battery light no start

12-30-2019, 06:25 AM

#1

starfighter

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r230

Red battery light no start

2005 sl500
Last night red battery light and no start.
Jump started and drove home 50 miles
On trickle charge all night
Charger said full this morning ..measured 13.07 v
Red light no start
Now reads 12.95
ideas ?

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12-30-2019, 07:30 AM

#2

bobterry99

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'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55

You have to clarify what you mean by "no start"; i.e., does the starter motor spin?

I presume you are reading the voltage on the rear battery. More important is the voltage on the front battery.

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12-30-2019, 07:35 AM

#3

starfighter

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r230

Starter does not spin
reading front battery
after 1 hr sitting votes =12.8

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12-30-2019, 07:58 AM

#4

bobterry99

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'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55

Quote:

Originally Posted by starfighter

Starter does not spin

I presume you hear the starter solenoid pull in. If so, then read the voltage on the starter battery at this moment with the aid of a second person or Star Diagnosis.

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