02 c320 no crank, no spark, no start signal from sam
Thread Starter
Newbie
Joined: Dec 2013
Posts: 10
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2008 c280
02 c320 no crank, no spark, no start signal from sam
hello all, i have an 02 c320 which all of the sudden just stopped cranking, stopped sending spark. locks and doors, lights, radio, everything working fine except for these issues. the starter relay is fine. i am not receiving the ground signal to the coil side of the starter relay. when i leave the key on and jump the relay it cranks just fine but has no spark
anyone?
....also fuse 52 is fine and has been changed to 20amp. i know this problem has been discussed before on this forum, however i felt my case was a little more specific since it is not a fuse or relay issue, thanx in advance for the help
anyone?....also fuse 52 is fine and has been changed to 20amp. i know this problem has been discussed before on this forum, however i felt my case was a little more specific since it is not a fuse or relay issue, thanx in advance for the help
Last edited by azbawood; Feb 3, 2014 at 04:15 PM. Reason: incomplete info
MBWorld Fanatic!
Joined: Jan 2005
Posts: 2,848
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From: Orange County
2005 C Wagon (No snickering please!)
Use a volt meter on the brown wires exiting the front SAM. If the voltage measured between the negative terminal on the battery and the brown wires in the SAM is more than .100 volt you have a loose connection there.
Thread Starter
Newbie
Joined: Dec 2013
Posts: 10
Likes: 0
2008 c280
,,,are these the ones you are talking about?? just check only the brown ones???...also, should this be a key on test or key off test?
Last edited by azbawood; Feb 4, 2014 at 01:57 PM. Reason: incomplete
MBWorld Fanatic!
Joined: Jan 2005
Posts: 2,848
Likes: 15
From: Orange County
2005 C Wagon (No snickering please!)
Yes, any brown wire is connected to chassis. Key on or off does not matter. The battery neg cable, the engine to chassis cable and the chassis ground post near the front SAM are suspects. Also the connections to the SAM could be dicey too. Look for good clean connections without any corrosion (green fuzz) and the connection is tight.
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