Hello,
I have a problem with my fuel pump. I want to lower the voltage bij adding a ballast resistor. I had one for an ignition, it measures between 1 and 2 ohms so I suppose it's around 1.5 ohms. When I put it in series with the pump (which is 3 ohms) I should lower the voltage of the pump to around 8.1 V. Total current would be 2.7 amps (U = I x R, 12V = I x (1.5 + 3), so I = 12/4.5 = 2.7 amps. I did this mod and within 1 second the inline fuse blows. It's a 10A, so should be fine, but also a 15A blows. I've hooked the ground up to a running ground wire in the boot, but I don't see this adding any amps. Does anyone with a better understanding of electrics have an idea how this can happen?