May need to replace Thetford Toilet Water Pump

PeterInSa · Guru

May need to replace Thetford Toilet Water Pump

TimTim · Guru

They are waterproof joiners and commonly used in marine environments. I have used them on my boat. If your are worried though and plan to use heat shrink over these joiners then use the glue lined heat shrink which will shrink down to 1/3 the diameter.

Peter_n_Margaret · Senior Member

I got rid of the toilet water pump and plumbed it into the main water system, also bypassing the thetford tank.
The thetford system is more trouble than it is worth. No more problems.
Cheers,
Peter

PeterInSa · Guru

Thanks, Re (glue lined heat shrink which will shrink down to 1/3 the diameter.)

www.temu.com/au/127-piece-waterproof-heat-shrink-tubing-kit-3-1-marine-grade--lined-black--wrap-assortment-for-electrical-connections-g-601099577891654.html

Re (plumbed it into the main water system)
The Thetford in our Caravan has this setup. The Sprinter Campervan has a Bench type Thetford C2? and would be a pain to convert.

valiant81 · Guru

Peter_n_Margaret wrote:
I got rid of the toilet water pump and plumbed it into the main water system, also bypassing the thetford tank.
The thetford system is more trouble than it is worth. No more problems.
Cheers,
Peter

Hi all; I also did the same in my own caravan. i used a 12 volt water solenoid valve ( E bay ) and did away with the way with the original water pump. Has worked for the last 2 + years and no problems. Our toilet is a Thetford C-402.

-- Edited by valiant81 on Wednesday 19th of March 2025 09:18:36 AM

Scubadoo · Veteran Member

I may well do the same when the used daily and so far completely trouble free original 15 year old C-402 water pump eventually gives up the ghost. Where is that wood!

PeterInSa · Guru

Proved its not a power problem to the Fuse in the Toilet. 13.3v is at the terminals. But heaven help me, if the power to this terminal block ( B4 the toilet fuse) goes missing, Because I cannot find where its power/Fuse comes from, would need to connect power to underneath the Sprinter to connect up to the cable that goes to the Toilet Terminal block.

Hi Tim, spoke to my local Jaycar store about using Solder Splice Heat shrink joins x3 and put the lot and the cable sheaths on either side of the join into the Marine Adhesive Heat Shrink.

He thought the weakness was the Solder Splice Heat Shrink, it could leak, if there is a problem with the outer Marine heatshrink.

Could I just joint/twist/solder the copper wires separately x 3 and use a smaller size of Marine Heat Shrink for each join and use a larger size over the 3 joins and cable sheath covers on either side of the join.

www.jaycar.com.au/2-7mm-solder-splice-heatshrink-pack-of-5/p/WH5670

Thanks