Brake system power with Battery disconnected
I have a 2016 Ford Focus 2.0 L Hatchback, the dealer installed the StaY n Play Duo braking system. Unfortunately he did not install a battery disconnect, he insisted the brake would not work if he di...
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We also have a Ford Focus and have the SMI system. You need to install a battery cut off switch on the positive cable only. The mechanic must also install diodes in the rear of the car in the original wiring for the tail lights. Diodes only allow power to flow one direction like a check valve. Installing diodes in the wiring will prevent current from back flowing from the newly installed wiring for the rear lights to the rest of the vehicle.
If your mechanic does not know what a diode is or what the term back flowing means, find another mechanic. It is essential they be installed correctly. The battery MUST be completely isolated from the SMI circuit that powers the brake vacuum pump.
We have towed several thousand miles now with this setup with no problems and love it.
If your mechanic does not know what a diode is or what the term back flowing means, find another mechanic. It is essential they be installed correctly. The battery MUST be completely isolated from the SMI circuit that powers the brake vacuum pump.
We have towed several thousand miles now with this setup with no problems and love it.
