Does the Third Eye light ?
If yes, problem in wiring harness to
taillights. If no, is power reaching switch ?
In extreme bullshit cases, run a fused
jumper into stop switch. This worked in
"Temper Tantrum 's " F Body, after a
beer bottle was used to troubleshoot the dashboard's printed circut.
Also check grounds, when in doubt,
add a grounding jumper from known good ground.