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It might be a loose/bad ground on the brake light circuit, find the ground points and verify no paint, corrosion or bad connections.
Do all your trouble shooting with known good standard bulbs in place, LED's can and often do start new never before seen problems.
Check the wiring to the brake light switch with the key on, engine off, is there power to one side of the switch?
Last edited by BornWestUSA; 07-13-2022 at 03:56 PM..
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