I know this post is somewhere on the Forum because I've read it before. Darned if I can find it when I need it. I need to recalibrate our holding tanks and can't for the life of me find where the elusive pin 15 is located. I thought it was behind the door in the middle of the dash. I'm frustrated because I've done this before but I guess my mind is leaving me. I can't remember where it is. I know I have to short pin 15 (I think) to the frame when I get all the tanks empty. Can someone share a link where this information can be found.
There should be a rocker switch under the dash near the middle of the dash to do this. I will try to find a post as to where to find it.
ETA does this help Recalabration of holding tanks (https://www.foreforums.com/index.php?topic=14180.msg81382#msg81382)
On my 2003 the rocker switch is in the top right corner of the kick panel in front of the passenger seat.
FYI - On mine, there was no rocker switch, just a wire hanging behind the panel on the right side as you face forward. I think I found it by tracing it from the Audit box. Maybe that's all they could afford for a U270. I added the switch and labeled it for me or future owners.
Rich