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Originally Posted by Whitrzac
my question is, how come it has those voltage spikes with a mech. brake setup and a clutch
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When you go quickly from any throttle to neutral, the magnetic field in the motor will collapse and generate a small voltage. Won't be near the amount that a brake setup has though, unless the motor IS in fact doing a little braking without you realizing it.
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Originally Posted by Bolt_Crank
I've seen my truck go from the 12 - 13 volts when sitting without the truck running, to 16 - 17 volts when I turned off my rack-o-lights... Though, that might be a strange backflow due to the relays themselves...
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Relays are coils and generate inductive kickback when shut off. Most circuits simply place a reverse-biased diode in parallel with the coil to shunt that spike.