Wierd Electrical Problem

[schwarb2]

Had my six at the shop to hook the wiring back up from the console gages.

Everything works now except when I turn on the headlights, the tach drops about 1,000 rpm.

Anyone have any thoughts - or does this mean my redline at night is suddenly 1,000 rpms higher?

Thanks

Barry

[914GT]

Check the +12V and GND wires to the tach that they are the correct. Something must be miswired where the voltage drop from the headlights is affecting the tach voltage.

[schwarb2]

Guy:

Thanks for the insight. It always helps to know where to start before you lay on your back and get up inside the dash.

Barry

[Dave at Pelican Parts]

Also check fuse #9. Take it out and inspect it. Either clean up the ends with a wire brush, or just s**tcan it and put a new shiny one in. Clean up the "arms" that hold it, too.

--DD

[schwarb2]

Thanks Dave for the suggestion.

Barry

[philinjax]

Barry,

This is my shot in the dark guess; If the rpm only drops when the light switch is on and low beams are sellected, the WH/BL wire (for the high beam indicator light) is interchanged with the RD/WH wire (which supplies power to the tach.). Both of these wiring connections are on the bottom rear of the tach.

Good luck,
Phil

[schwarb2]

Phil:

I'll check that connection. It is an easy one for me to reach without a lot of contortions.

Thanks.

Barry