Re: [Amel Yacht Owners] Genset starter voltage drop

Mohammad Shirloo

Hi Paul;
The most likely issues with low voltage at the starter when a load is placed, assuming that the wiring has been sized properly are:
  1. A weak starter battery,
  2. A bad connection somewhere along the line from the battery to the starter.
  3. Damage/corrosion to a portion of the wiring that has led to increased resistance to a portion of the wire.
  4. Internal issues with the starter that lead to higher than required Amp draw.
I am not familiar with the white box you speak of. Our 54 being only one model younger than yours, I would assume that we must have the same but have not run into it as of yet. We are not currently on board, so I cannot help much in that regard. There may be and issue within this box. However, the fact that you have only 9 Volts under load before this white box, indicates an issue prior to this point also. I would not expect the voltage to get any lower than 10.5 Volts when the genset starter is engaged.
Mohammad and Aty
B&B Kokomo
Amel 54 #099

From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Monday, March 26, 2018 5:25 AM
To: amelyachtowners@...
Subject: [Amel Yacht Owners] Genset starter voltage drop


Hi all,

I'm seeing  voltage drop to my Onan 11KVA genset to the point that the starter won't turn enough to start the generator. The drop seems to be mostly between the input to the white control box and its output to the starter. I have been unsuccessful in pinning it down to any particular terminal and suspect there may be a connection hidden somewhere in this white box. Under load the voltage at the input to the white box is about 9V, and at the output about 6V. I did not yet dismantle the white box because it means uncoupling the exhaust I wonder if anyone has any experience of this and would be able to provide some advice.

At the same I would just like to say that I'm very grateful for all the help I've been given by members of this forum and hope that one day I may know enough to be able to reciprocate!

Ya Fohi - Amel 54 #98

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