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Memory retainers are a good concept, but no way will they work in a MB cig lighter. MB cig lighters are unpowered in the key off position and a 9v battery won't nearly power everything that gets switched on the same time as the lighter.
WE use a high powered gel battery what is inside those jumpstart boxes. Every model is different but we tie into a non switched term 30 somewhere.
On that ML I think we go to the large 80amp Traction control pump fuse.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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