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Old 09-01-2018, 11:38 AM
ah-kay ah-kay is offline
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Join Date: Mar 2009
Location: San Diego
Posts: 3,537
Let me hold your hands one more time.

1) solenoid works or doesn't work. It is only a coil and the MTBF is in the million.
2) there is a big metal contact inside to shunt the 12v to the starter motor. They can be pitted and don't make good contact. Starter/engine motor will not turn as a result.
3) the starter motor winding plus the carbon brushes are in series of the pull solenoid. If they are not in good shape then the solenod will not pulled and shunt the big contact. So no click noise. No starter/engine turn.

Good luck.

Let me make extra comments.

a) If you don't hear the solenoid click ( pull solenoid working ) then it could be the pull solenoid or the starter motor winding/carbon brushes. The winding and the brushes are in SERIES with the pull solenoid. That is why sometimes you hammer on the starter motor and it will work. It is because the carbon brushes is on a dead spot on the winding armature.
b) If you hear a click but no turn then it could be the BIG contact pitted inside the solenoid or the starter motor winding/carbon brushes faulty.
c) Solenoid and start motor are interdependent and is difficult to be 100% sure which one is at fault.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

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Last edited by ah-kay; 09-01-2018 at 12:17 PM.
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