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Brake lights only work when parking/headlights are on

  

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Mazda 2003 t4600 (Winnebago Australia), had vehicle from new, just recently fault consistent, no changes to electrics?


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Well you have some type of an electrical short pray that someone put the wrong bulbs in I have seen that happen many. But if not that either the wires are crossed or even worse there's a problem in the body control module a small computer that operates all those systems and they're not cheap to replace and reprogram


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