So, my 99 Prelude SH is showing a buttload of shorts to ground on all the sensors downstream of the I/M....I crawled under there and found the ground junction, and it looks like the connector cap is missing that makes the connections for these sensors. I'm trying to find a replacement part, but ii don't know what it'd even be called technically, let alone a P/N.....does anyone know what the missing plug cap for this ground junction is actually called, or the replacement part #?

 

That’s a Sumitomo HW Sealed series 14-pin connector, so you can try to find a cap based on that info. If it were me I’d start looking at junkyards nearby to pull a cap from. That same connector/cap can be found on 96-00 Civic harness and probably other chassis. Ghetto option would be to depin the wires and crimp cap the bussed wires together (1-7 and 8-14). Also curious why you have a short to ground. With that cap off you should have an open not a short

 

It is not solely to split ground.

That junction connector (C117) is used to split/distribute power (1 - 7 via the Blk/Yel wires) and ground (8 - 14 via the Yel/Blk wires for SH).