that's the problem, two controllers do not make up for a twin motor controller very well
If the originals are independend (differentially powered)
you need to do that yourrself externally (manipulated throttle signal to each controller)
FN was kinda famous for having mastered this electronic and code mess
and since the gokart was 'testvehicle' for that kinda innovation I'm afraid that's what voided is dealing with
Which you would have to scratch code and build yourself,
frankly I'd have a few ideas for that but the testing for those ideas alone would take months.
I'd be scared in a kart that powerfull with a messed up throttle signal going chaotic.
If those are just powering the same fixed axle, you would still need to laod balance the motors externally (again manipulate the throttle signal) but in a much lesser complicated fashion,
still needs to be tested to a degree in order to keep the motors alive, have failsave modes and all that ...
And likely you have a lesser agile kart in the end.
I almost bet I could get that controller to work if I had it here.
The PCB looks still good, a few hairline cracks in the coating is all I can see from here..
I also bet that 90%+ of the partsa re in working condition.
The ONLY part that is certainly not fixable (or replaceable) is the FNR microchip,
they had them made to their specs for all I know and burned custom code in house,
they're not available to the public anywhere.
And even if you find one, you can't tell if it's the same code burnt in or not.
SO that is the one thing that can render the original controller dead.
There are a few golf carts with a twin motor controller for all I know,
so there are options available.
If any is viable.. IDK *shrugs*
but frankly, it's the controller that makes this kart unique and maybe even historically relevant to some degree.
Since that carries all the innovation Frazer Nash was wanting to test and improve upon.
IDK what power the motors draw so I can't tell what size controller
would be able to power them reliably.
but I guess the 550 Amp version should be plenty.
I doubt they draw much more than 240 Amps each tbh.
the controller carries 20 MosFets.. assuming ten per motor and no reverse..
and assuming 20-25 Amps per mosfet makes 200-250 amps per motor
just a guess, but you rarely see Mosfets with more than 20Amps used in a constant power
config (the pcb would quickly heat up to desolder itself)
very large cooling fins on the controller case...
*shrugs* maybe 40 amp MosFets? *headscratch*
Anyways.. voided doesn't need to guess,
a look on the mosfets will tell what model they are,
and with model and count he knows what the controller was able to provide
and he just could match to that and it should be good
'sid
(a long time ago)?