How to ground PDC?

TT5.9mag said
This entire time I’ve been reading the title of the thread wrong. I read PDC as PCM, (powertrain control module, aka ECU). The PDC (power distribution center) is not externally grounded per se, all of the sensor ground and relay grounds are ganged in to JC-1 connector and must be routed to ground. At least in my 01 ram OBD2 PDC that’s what it’s labled as. Grounds will be black or black w/blue tracer. 97 may be different. Pic attached and JC-1 circled in red. I tied all of mine together and ran a dedicated 10ga ground direct to battery negative. Sorry for my confusion.
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No problemo at all, thanks for the new info. I guess I was correct in hearing about some grounding the PDC. However, it appears that it may be only with 2001 and newer. Take a look at pic below, my box is very different than yours, no JC-1 or similar. Would it be safe to say that I do not have a way to ground my box and I'm limited to the harness ground?