More than likely wiring layout. - When you move electrics from 1 car to another the wires sit in diferent places.
Make sure that all the power wires are as far away from any signal wires / receiver as possible.
(remember power wires may move when you plug the battery in / fit bodyshell.)
Also, if he's running a long receiver aerial, do not coil it up inside the car. - Leave any excess length hanging out of the top of the aerial.
Maybe post a picture of the car wiring.
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