Yea, its an odd setup. Looks like both buttons flush it to the tank based off the post. If I can find the bullet diagram as it def looks like a different setup than yours. I could always just replace the pumps, lines and tanks making sure I hook everything back up to the same spot haha..

Note to Self----Go to swim platform and PEE!! problem solved

I have the same issues I can't figure the pump out. I have two buttons in the head one higher then the other with no markings on them. Of course when I push either nothing happens so I am lost also but will have to check motor to see if it is bad or not. In the middle of a restore and batteries are out so I will have bide my time, but would love some ideas on what is what also. 1988 bullet.

I figured it out.. I can send you the diagram with the instructions on how the setup works. One button is the water pump and the other is the macerator. Both are 12V so make sure they are getting power. If not, then need to get new pumps. I just picked up the Jabsco 2.9 for the water, a Jabsco Y valve and macerator. I'm replacing everything in the system to start fresh. PM me your email address if you want the diagram.

They are very prone to the macerators rusting up and then blowing a fuse. For 200 bucks I'd buy both pumps and start with a known good baseline.

There is a long thread in here that OldSchool started years ago. "bullet head redo" or something like that. It has a ton of info in it.

It should be on the first page. I commented in it a few days ago to push it forward so I could find it easily. Im good to go now, now that I have the plumbing layout and understand how Cig used a vacuum loop for the holding tank. Like I said before, I just want to understand what I'm replacing before I do it lol.. Makes more sense to what I'm doing.:D