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we have turn signals but no back up brake or warning signals we get power to signal switch on transmission but not beyond that point should this modual be changed keep in mind that this is a 1981 Ford f150 and if this modual is changed will that help?

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Q: Why will the brake lights warning lights and backup light not work if fuses are good get power to trans but no further this is a 1981 Ford F-150?
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