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Hi, I'm fully aware that, max 3k rev limit is limp mode. It drives good, pulls ok to 3k. Kinda slow, because 3k rev limit, but it gets there quick. Kick down is also not working, so = limp mode, buuut, if I keep starting and stopping engine and checking if it let's me rev past 3k, and it does...

I did remember seeing somewhere, that a fella recommended to disconnect SBC harness and clean connections from dust etc. So my thought is, how plausible is this even and is it worth trying. I haven't tried it yet, but seriously thinking about it. Both batterys disconnected now, been doing...

Sorry I haven't expressed myself correctly. What I meant, that if the aux battery will go nuts after assembly, then I will just pull these mysterious wires apart and see what happens. Thank you for your input:) regards

Honestly I wouldn't know. But thank you. If aux battery after this will go tits up again, I'll just disconnect it and see for now, cars broken as it is :D

Thanks. Tried tracing it back, god knows where it goes, not aux , nothing

Hi, So I was getting a lot of errors on my cluster on e270cdi w211, decided to check aux battery (still original 15years old lol) I have found these two wires connecting each other. Don't know what It is, and Google search brought up nothing. Please help, regards Imgur