The brushes might not be moving freely, if they aren't sand them down a tad so they can.
SOURCE: Dewalt cordless drill
You have burned out the drill motor, it is shorted, the battery smoked due to a direct short, one thing I don't understand why the thermal limiter didn't trip in battery pack, I would contact manufacturer and try to get hem to buy you a new drill.
SOURCE: bosch psb 600 drill will not reverse
The red button sits on a lever that changes the polarity of the switch output. If this lever feels loose and you can't feel it engaging anything then you need to split the housing and make sure it is seated properly. If it is, and the lever on the switch is moving fine aswell then you should check all the wires coming out of the switch, and if they are all connected properly you will prob need a new switch.
SOURCE: I have the black and decker hammer drill model
look at the back of the brush holder for a tab that the forward/reverse lever locks into, it might be broken not allowing it to shift.
SOURCE: Kawasaki 19.2 cordless drill
Re: Burned trigger switch: call the number on the drill (800.590.3723) and tell them what happened. They will offer to send you a new switch or have you send the drill in for replacement of the switch--although the person I talked with said they would probably just replace the whole drill.
SOURCE: dewalt cordless drill dc988- drill motor works
Test the brushes by catching it in a stalled condition when you have it triggered, then rotate it slightly. If it takes off suspect the brushes or a dead segment on the comutator.
If it doesn't respond to this, then consider the VSR trigger... open it and test by bypassing it when in stalled condition...
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