Hi Rowen, Graham, Chris,
All very valid points, but -
I started with an even simpler thing - looking up the Specs of the components and Battery voltage required! (My test engineer instincts coming through 😉)
I believe that 12V is not enough for this ESC / Motor combo.
I found the same manual as Graham and checked the ESC specs, see page 1.
Esp. Operating voltage and Battery type (relevant for Cut off voltage!)
The ESC expects a minimum of
14 NiCad / NMIH cells, =16.8V NOM
or 4 LiPo cells. = 14.8V NOM.
So I strongly suspect that it detects a 12V SLA as a deep discharged battery and goes into Cut Off mode, i.e. shut down, with beep beep beep ... alarm.
Unfortunately the ESC manual does not specify the default values.
These may well be in the Programming Card manual though.
Strongly recommend that you buy the programmer Chris, much easier and quicker than 'beeping around'.
The motor spec also specifies higher voltage;-
"Energ Brushless motor, suitable for large model boats such as Sea Queen
Battery - 5-6 cell Li-Poly, 20 Cell Nimh (18.5V / 22.2V NOM Lipo, 24V NOM NiMH)
Weight - 300g
Connectors - Gold included
Working current - 40-80A : Peak 85A
Shaft diameter - 6mm
Speed Controller requirement - 85A."
Either get another 12V SLA and put the two in series or (and much better cos the ESC won't recognise the two SLAs and may 'think' they are a 20 cell NMIH) get yourself a 5 or 6 cell LiPo.
That will be much lighter and have a much better power to weight ratio than the SLA.
SLAs are generally not happy delivering high currents.
They were developed essentially for long term back up low current supplies.
Hope this helps.
Cheers, Doug 😎