1985 Porsche 944 no tail lights and the tach guage and MPG

Tiny
KHRISTINE HUMPAL
  • MEMBER
  • 1985 PORSCHE 944
  • 4 CYL
  • 2WD
  • MANUAL
  • 14,200 MILES
We bought this car drove it about 100 miles it sputtered and died. We replaced the ecm it started right up. It started charging at 17V we replaced the alternator and it runs fine. I have no tail lights, the tach and MPG guage constantly jumps at idle. It goes to zero then jumps.
Tuesday, September 22nd, 2009 AT 7:57 PM

1 Reply

Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
When you changed the ecm did you disconnect the battery? If not disconnect the negative side of the battery and with it off check all the connections grounds, not only around the battery but the rest of the car. The tail light could have blown a fuse and with the tach and mpg acting up it sounds like a bad ground or a loose wire. Some wires look clean in reference to a ground but underneith there could be getting a bad contact. I do not think it is in the ecm as the lighting system runs on its own line
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Wednesday, September 23rd, 2009 AT 9:56 AM

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