Hi Marcodufor,
I agree with Paul, the relay should be checked. The other obvious check point would be the fuse and the switch
I assume they were working before the journey.
Has any mods been done to the car since they were known to be working? Especially electrical repairs etc...
Ok. The interesting thing is that neither is popping up, so this would rule out individual motors being faulty. With that assumption you are looking at power going from the supply (battery), through the fuse, then the relay, the switch, and finally the motors.. There is likely to be some form of resistance in the path since Current to the motors would need to be limited and this resistance could be internal to the motors.
A wiring diagram could help verify this.
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You would be fighting in the dark unless you have the wiring diagram. Or you are familiar with the circuits.
Here are a few things you can try; Although I'm not sure how accessible various pojnts are.
1. Check the relay and the fuse of course...
2. Test the switch.
3. check the wiring by doing continuity tests between the battery, switch, relay and motors.. This is to ensure there is continuity in the wires/wiring. I.e. no broken wires.
You could (potentially) verify that the motors are okay by feeding the motors directly with power though some form of current limiting would be wise. I assume the DC motors on these turn one or the other way depending on supply polarity. If you do try this and only after all else fails, make sure you remove the wires going into the motors from the car as to isolate the cars electeics from your testing of the motor By powering them from an external battery.
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