FAQ:Having issues with newer Digitrax throttles, such as DT602D or UT6, only getting power using Loconet?
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For many of the newer Digitrax throttles, if you insert a cell into the battery compartment backwards, you will blow the fuse which is in line with the battery.
When inserting the AA cells, be careful, especially when inserting the middle cell: You can push down the contact tab, which can then short to the PCB underneath and again, blow the fuse.
If the fuse is blown, the throttle will work when connected to LocoNet, but not on battery power.