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hehe, 4 pins only? USB I hope?50D has extra pins the grip doesn't go to.
the 5D repair manual says its pins are those:(middle two rows, maybe meant for grip)BATDOORAFSELLGSELSW1SW2DIAL1DIAL2VCHKONAELOCKBATSEL1BATSEL0(outer rows, maybe debug)TXDMPU RXDICUTXDICU RXDMPUMON1 MON3MON0 MON2
So you'd have to solder to those pins, they are there in my grip making contact.
TXDMPU RXDICUTXDICU RXDMPU