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The nylon guide may have worn down and no longer catches. The switch needs to be disassembled (watch out for the tiny spring, rcmd using a zip lock bag to take apart in) and all the old grease cleaned out then a nice lubricant with Teflon (skip using grease) used for lubricant. NO WD-40 !
Anyhow, reassemble and try it. As an aside, most folks leave it in the on position. Doesn't hurt anything g and acts as an indication the charging system fuse is good (same circuit).
Anyhow, reassemble and try it. As an aside, most folks leave it in the on position. Doesn't hurt anything g and acts as an indication the charging system fuse is good (same circuit).