No crank issue
07-15-2024, 09:01 PM
#1
Junior Member
Thread Starter
No crank issue
I have a 2009 s600. The car had been sitting for a while but I started it up a couple weeks before I attempted it again. Drive fine and ran perfectly. A couple weeks later, it wouldn't start. Now I know the car has had a parasitic draw somewhere so I figured it was that. So I charged the battery and tried it again but still a no crank. I can't tell if it's making a click or not. But I've swapped both starter relays and the starter. Only thing I can think is maybe there is corrosion on the battery terminals. But I've also seen that maybe the front SAM could be bad? What should I try next. I know it's no locked up because I turned it over super easily by hand before I changed the starter.
07-16-2024, 12:29 AM
#2
MBWorld Fanatic!
Start battery comes to mind.
Before another blind blast of the parts cannon do some real diagnosis. Do you have a test light? You need one that uses an incandescent light bulb. Preferably one such as was used in a dome light for a Mercedes in the 1970s. ‘Test probes’ that have digital volt meters or LED’s will lie. An incandescent light bulb will draw enough amperage to say ‘Yes, this circuit may even be able to trigger the starter.’
Is there 12 volts to the big lug on the starter? Is the signal getting to the small wire on the starter which tells it to crank?
Are grounds between engine and chassis intact and tight?
Before another blind blast of the parts cannon do some real diagnosis. Do you have a test light? You need one that uses an incandescent light bulb. Preferably one such as was used in a dome light for a Mercedes in the 1970s. ‘Test probes’ that have digital volt meters or LED’s will lie. An incandescent light bulb will draw enough amperage to say ‘Yes, this circuit may even be able to trigger the starter.’
Is there 12 volts to the big lug on the starter? Is the signal getting to the small wire on the starter which tells it to crank?
Are grounds between engine and chassis intact and tight?
07-16-2024, 09:24 AM
#4
Junior Member
Thread Starter
Start battery comes to mind.
Before another blind blast of the parts cannon do some real diagnosis. Do you have a test light? You need one that uses an incandescent light bulb. Preferably one such as was used in a dome light for a Mercedes in the 1970s. ‘Test probes’ that have digital volt meters or LED’s will lie. An incandescent light bulb will draw enough amperage to say ‘Yes, this circuit may even be able to trigger the starter.’
Is there 12 volts to the big lug on the starter? Is the signal getting to the small wire on the starter which tells it to crank?
Are grounds between engine and chassis intact and tight?
Before another blind blast of the parts cannon do some real diagnosis. Do you have a test light? You need one that uses an incandescent light bulb. Preferably one such as was used in a dome light for a Mercedes in the 1970s. ‘Test probes’ that have digital volt meters or LED’s will lie. An incandescent light bulb will draw enough amperage to say ‘Yes, this circuit may even be able to trigger the starter.’
Is there 12 volts to the big lug on the starter? Is the signal getting to the small wire on the starter which tells it to crank?
Are grounds between engine and chassis intact and tight?
07-16-2024, 09:27 AM
#5
Junior Member
Thread Starter
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