I agree with you – the NASA supplied battery leads are not really man enough for the job. I bought some new black leads from Halfords and used 2 of these in parallel for the connection from the battery negative to the shunt. I think I also soldered a smaller terminal onto the original battery negative lead so it would fit more comfortably on the other side of the shunt.

I will be on the boat for a short time tomorrow (Tuesday) afternoon. I’ll drop you an email with contact details.

If you can’t make that I’ll take some photos and email them to you.