Stop circuit draining battery on 1998 fourtrak

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Hi I'm new here, and not very tech.
I've been having trouble with the battery draining on my fourtrak. Put a new battery on first which lasted 2 weeks.... back to original problem. Took to the garage and alternator all working fine. Mechanic said to pull fuses to see where the problem is coming from. I've had a multimeter in all the fuse holders and it is the "stop" circuit that is deaining the battery. We've disconnected tow electrics, rear lights etc and brake switch and the drain is still there. An auto electrician said something could be wired to the circuit. I'm wondering if anyone knows what, other than the brake lights are wired to that circuit? Need to trace radio behind steering column... any ideas as can't seem to find a local auto electrician. Thanks