Unlike the older 'Series' FFRs (which were 24V throughout) the Defender FFRs are dual 12/24V. What this means is that they have a regular 12V alternator and underseat battery for all the basic vehicle systems (lamps, blower etc.) and a separate 24V system for the radio equipment. The radio batteries fit under the operator's table in the back of the vehicle.
The 24V generator sits roughly where the aircon would be on a late civilian Defender and has its own drive belt. I removed it to get access to the injector pump. The close-up shows the generator and mounting bracket on the bench. It's a big beast, as you can see - rated at 90A at 28V . The long threaded rod is the adjuster for the belt tension (the bracket is shown sideways in the pic).
Unlike the older 'Series' FFRs (which were 24V throughout) the Defender FFRs are dual 12/24V. What this means is that they have a regular 12V alternator and underseat battery for all the basic vehicle systems (lamps, blower etc.) and a separate 24V system for the radio equipment. The radio batteries fit under the operator's table in the back of the vehicle.
The 24V generator sits roughly where the aircon would be on a late civilian Defender and has its own drive belt. I removed it to get access to the injector pump. The close-up shows the generator and mounting bracket on the bench. It's a big beast, as you can see - rated at 90A at 28V . The long threaded rod is the adjuster for the belt tension (the bracket is shown sideways in the pic).
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