Masse - and Masse + lights

Rudolf Waldispuehl

Dear Amel Group Friends


I’m asking you guys if someone had the same or similar experience and what is your advice for my question:


I have a Negative Leak light on the 24V Pump-Motor of the Dessalator Duo. There is a Bonding wire (yellow/green) that runs from the Bonding strap in the grey-water sink to the Dessalator. But this wire is disconnected on the Dessalator unit. When I’m connecting the 24v pump directly to the bonding system the negative leak remains. Light is still on. 


The light does only switching OFF when I’m switching the pump on, or if I’m disconnecting the negative wire. 

BTW:  I cannot see any corrosion on the Dessalator unit. The DC motor itself has no contact to saltwater, - it's only the pressure pump in contact with saltwater (but no 24V connection).


- Does it mean I need a new 24V DC Motor? 

- Are there any longterm experiences what can happen if a negative (or positive) light is not fixed? 

- What is the affect and result of a longterm neg. vs pos. leak?


It’s very easy to get miliAmps of current on a 24V motor with brushes and wires, etc. Are we AMELies to paranoid with these lights?


Best regards


P.S. I still not fully understand how these lights working. To my understanding it is indication a leak from Masse - and Masse + against the AMEL bonding system. Maybe I’m wrong?

Von: "" <> on behalf of Bill Rouse <brouse@...>
Antworten an: "" <>
Datum: Mittwoch, 20. Februar 2019 um 14:21
An: "" <>
Betreff: Re: [AmelYachtOwners] Masse - and Masse + lights

In the circumstance you describe, the light indicates that there is a connection (resistance) between either the positive or negative and the case of the macerator pump. That "connection" is usually saltwater leaking past the seal on the pump. It is an "early warning system" that your seal is leaking and your pump will fail. A switch such as you suggest will certainly be a "see no evil" solution.🙈😀 You could accomplish the same by disconnection the yellow/green wire from the case, but, don't you really want to know when you have a seal leak.

Bill Rouse
720 Winnie St.
Galveston, Texas 77550

On Tue, Feb 19, 2019 at 8:25 PM <derickgates@...> wrote:
[Edited Message Follows]

I have been diligently checking the Masse- and + lights in the companionway. Over the past 5 years when one of the lights go on (usually the Masse - ) I go and disconnect the power lines to the forward or aft head and sure enough, the leak of current to ground stops and I replace that Jabsco pump. Recently the Masse light did not go out until I had unplugged both the heads at the same time, indicating to me that both the head pumps were leaking to ground.

It occurs to me that instead of replacing the pump, I could just install a toggle switch to the offending brown or blue wire, so that I can turn the circuit on when anyone uses the head, and turn it off in the interim.  Then I could continue to use the offending pump until it dies a natural death.

Am I fooling myself or would installing that switch stop the current leakage to the Amel bonding system?

Derick Gates
SM2K #400 Brava

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