I haven't got the describe software hooked. It did try using a carbattery as powersupply (with and without charger) and I have the same result: the sabertooth 2x25 works fine, the Syren10 gives a fault.
I hope dimensionengineering has a solution but I am starting to think the syren10 doesn't work with the kangaroo x2 (according to their site it should). Normally I wouldn't consider this a problem and just buy a sabertooth. But I am a teacher electrical engineering and a few months my school bought 6 syren10's for the students. So it just ordering sabertooth is not an option

Should I finf a solution I'll let you *
Thanks for the advice,
Bart