I'm having some problems with my servo, no response when trying to turn the wheels, so I took it apart and found a little blue wire was disconnected. So I assuming this is my problem. Does anyone know where does it come from and lead to?
yeah, looks like you found your problem. that blue wire should be attached to the drain of the steering fets. if you look at the servo where the blue wire came from, there should also be a red wire which should lead to the drain of the fet furthest away from the servo. the blue one should lead to the drain of the steering fet closest to the servo. all ya gotta do is solder that blue wire to the drain of that fet and you'll be racing again in no time
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