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yes - just like a Jake… and it turns the fuel off. The battery says no more.. so they had to slow it somehow other than the wheel brakes. Basically the engine becomes an air compressor.

💡 How about aftermarket plug-in to make custom noises? Like an 8V71 Detroit or maybe a Shovelhead? That would be cool!

Yes, That's how it works... When the Electric "Motor" (Gen) can no longer slow the truck down because the battery is full, the gasoline "engine" comes on - without the gasoline! Most hybrid drivers have not experienced this (yet)... We were coming out of the Rockies into Denver with the Power...

When going down long steep hills the hybrid uses battery charging to provide downhill resistance / braking. When the battery gets fully charged and cannot provide braking to slow down, the engine will come on to provide engine braking with fuel turned off. The engine provides braking like a Jake...