oil light,battery light, no tach - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• oil light,battery light, no tach by James8485 on 15 Apr, 2009 16:39
• so i was driving and looked down and my tach wasnt working worked fine last time i looked at it, and my oil light was flashing and battery light was on.
  any body have any ideas.
  
  checked oil and it was full but why my tach not working???
  
  alternater prob?
• #1 by Jettagli16v on 15 Apr, 2009 17:21
• I think that should be a ground issue.
  Just a guess, but I had an intermittent oil and alt lights until I cleaned the ground on the firewall.
  
  -Brad
• #2 by veedubcanuck on 15 Apr, 2009 20:33
• This happens when the alternator fails to charge. Either it's bad or bad wiring.
• #3 by James8485 on 16 Apr, 2009 09:06
• ok i could see if my batt light and tach dont work it being an alternater but why the flashing oil light?   are they connected in some way?
• #4 by Vincent Waldon on 16 Apr, 2009 10:18
• Quote from: "James8485"

  ok i could see if my batt light and tach dont work it being an alternater but why the flashing oil light?   are they connected in some way?

  
  
  Yes, the dynamic oil pressure system uses the W signal from the alternator as one of its inputs... sometimes wonky tach signals can confuse it.