Jabsco 146sl repair - Jabsco 60080 0012 Marine 146sl Remote Control Marine Halogen Searchlight (12 Volt 10 Amp 175000cp Joystick Control)

http://media.channelblade.com/EProWebsiteMedia/3506/Jabsco%20Twist%20n%20Lock%20Manual%20Toilets.pdf

the above is the link to the operators and installation manual see pages 3 and 4 this tells you how to install the inlet pipe so just reverse for removal

Contact your local Jabsco retailer or their technical site here: Jabsco How to Videos Jabsco Tech

I think these fellows should be able to assist you.

https://www.lobepro.com/maint-lobepro-parts.php

https://www.allpumps.com.au/assets/pdf/jabsco/jabsco-hy-line-ultima-lobe-pumps.pdf

http://media.oem.se/Archive/FilesArchive/117756.pdf

HyLine and Ultima Lobe Pumps 52Pages

go on line --google --and type in jabsco water pumps repair manual. If you find a free down load select the workshop manual and you will get what you want

I have an older unit, but this might help...
Thick Black wire is Earth or Ground
Thick Orange wire is Spotlight feed +
Thick Grey Wire is Flood feed +

Green and brown wires are motor up/down
Yellow and Blue are motor Left and right.

Check the power source to toilet and all wiring conversed.

Did you ever find a bulb? I need one too.

Try this link
http://www.ittflowcontrol.com/marine-and-rv/searchlights-floodlights/60020-series-135sl-remote-control-searchlight.htm

I am fairly familiar with Jabsco switches but I don't recall a sonic switch. Do you have a digital photo?

Seems like it MUST be replaceable. Look it up on the net. http://www.google.com/search?source=ig&hl=en&rlz=1G1GGLQ_ENUS331&=&q=jabsco+searchlight+parts&aq=1&oq=jabsco+searchlight