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Now that MS! has identified exactly what wire this is, install a toggle switch or simply cut it inside back cover: done!
I'd leave the fragile connector pins alone. 🤞
Yeah, that's my "plan A" -- the problem is that the large ECU connector looks pretty complex to disassemble without braking a whole bunch of tabs. But, I'll give it a shot this weekend.
First drive was a success - but, as can be seen on the schematic, removing the ALT-LIN at the ECU also disables the oil level and temp sensor. This, in turn, will prevent me from being able to use launch control... and I can't tell when the oil is >= 176F in the AMG menu, which is important to know so the engine doesn't get pushed before it's ready... so, cutting at the ECU might not be the right move and I may reconnect it...
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Originally Posted by QuadTurboPrius
First drive was a success - but, as can be seen on the schematic, removing the ALT-LIN at the ECU also disables the oil level and temp sensor. This, in turn, will prevent me from being able to use launch control... and I can't tell when the oil is >= 176F in the AMG menu, which is important to know so the engine doesn't get pushed before it's ready... so, cutting at the ECU might not be the right move and I may reconnect it...
What year is your car again? I have the AMG Menu modification from @BenzNinja which basically adds the menu to the IC for non-AMG cars. It shows oil, coolant, and transmission fluid temps.
> IF /THEN /ELSE:
-- If cutting ALT-LIN at ECU disables B40 LIN oil sensor...
-- then you have to find the splice location and cut down that branch....
-- else lower near ALT. G2 ALT-LIN C1 branch cut from B40 OIL-LIN C1 splice
Last edited by CaliBenzDriver; Feb 22, 2025 at 07:54 PM.
If cutting at ECU disables B40 LIN oil sensor... then you have to find the splice location and cut down that branch.... or lower near ALT G2 ALT-LIN C1 branch cut from B40 OIL-LIN C1 splice
Yeah, I'll have to figure out a way to get to the back of the alternator
Confirmed 1,000 rpm is the trigger to start charging for OM651. If I do a light blip under 1k rpm nothing happens.
Good and important info, thanks
If I may know your VIN, I want to check if this is because of a typical Valeo alternator, or because your alternator has AOP pulley. Overunning pulley.
AOP pulley is being discussed here : https://mbworld.org/forums/e-class-w...ml#post9118647
The AOP pulley P/N for my friend's M271.8 is below : ....................NOTE : A646-xxx the older P/N , there was a diesel engine OM646
The alternator for M271.8 is below : 150 amps valeo
Good and important info, thanks
If I may know your VIN, I want to check if this is because of a typical Valeo alternator, or because your alternator has AOP pulley. Overunning pulley.
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