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Black Deposits to interior of Brake Light Switch
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There are two contacts, one on each side of the vertical plunger under the copper metal. The set of normally open contacts on the left side that carries the power for the brake light filaments, (15 amp fuse F15P), is apparently not heavy enough as the contacts deteriorate and generate the black residue.
The set of normally closed contacts on the other side appear to be sized OK. There is not as much current, (5 amp fuse F66P), flowing thru the contacts to the ABS module, however the contacts are likely adversely affected by the black residue produced by the other deteriorating set of contacts.
One presumes/hopes that the newer replacement switch now has contacts heavy enough to carry the brake light power. It would be ideal if the ABS set of contacts were sealed from the brake light contacts to prevent contamination of the normally closed set of contacts.
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