The other type has a standard solenoid that takes about 40-50 amps to pull the solenoid in and then drops off to a couple of amps to hold it in whilst it is cranking.
I am not sure if the standard solenoid should ever be fitted to the A class or whether this problem has arisen by reconditioning companies and suppliers of non genuine units fitting the wrong solenoids.
If you disconnect the solenoid wire in the battery carrier and check the wire with a test lamp, Will it power the Test lamp. ? If So, You could try fitting a relay in the battery carrier to pick a Battery feed and send it straight to the solenoid. ( would be a lot easier than dropping the engine out to fit a starter motor.)
You could use an ammeter to check the solenoid current to see which type is fitted, If its the one with electronics in it, it will take virtually nothing, if its a standard solenoid it will take 40 + amps for a split second until it starts to crank.
If you check the one off the vehicle it will take 40 + amps continuouosly if you just power the solenoid without connecting the Battery + terminal. ( Assuming its a standard type solenoid )
Is the one supplied with the car a new one or second hand or has it already been swapped. ??
I am thinking that if it has already been swapped it might have had the standard type solenoid fitted and the system is not powerfull enough to operate it. ??
H.T.H. Tony.
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