06 E320 CDI

Where do I hook up a trickle charger on this particular MB diesel model?

I'll be storing my CDI for up to 6 - weeks at a time, and I don't want to unhook the batteries every time.

Part B): Is there ONE contact point that will keep BOTH CDI batteries on the one trickle charger?

Thanks for any experience / expertise with this MB diesel model with (2) batteries on-board!

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'06 E320 CDI
'17 Corvette Stingray Vert