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      01-19-2024, 08:44 AM   #1
JayD
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Drives: 08 335i
Join Date: May 2008
Location: upper mid-west

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Dahler tune install question

I bought a Dahler tune a few months ago and now that my run in service is done I am ready to install it. Seems straight foward. Read the instructions that came with it and watched a youtube video on install. My question is my wiring harness does not have a dedicated red power and black ground connection. the directions dont call for any direct battery connections but one youtube video showed a power and ground cable connection. the harness or box has no provisions for a power and ground cable. what am I missing here? any input would be helpful. thanks. I assume the harness is the same for the M2, M3, and M4

Jay
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