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Tach wire

W webbers1972 Pantera, Restored. How do I put pic on here?
IN THE WHITE PLUG ABOVE THE BALLASTOR, I HAVE A LIGHT TOGETHER WITH A BL/BK WIRE. THE BOTTOM OF THE WHITE PLUG, ONE LIGHT BLUE WIRE. NOW. WHEN I PUT THE LIGHT BLUE WIRE ON THE MINUS SIDE OF COIL THE ENGINE CRANKS AND WONT STARTG. BUT, WHEN I PUT THE LIGHT BLUE WIRE BACK ON THE TOP OF THE BALLASTOR CONTACTG. IT STARTS. BUT I STILL HAVE NO TACH!. WHAT GIVES.
Original Post
J jb1490Member
Make sure that the wires are connected correctly at the back of the tach. The red wire (light blue for early cars) goes to the + terminal. Check for + 12v at the tach + terminal with the key on and the engine off.

Next check is to disconnect the blue / black wire from the back of the tach. Connect a voltmeter to the disconnected blue / black wire and to ground. Put the voltmeter on the AC scale (NOT the DC scale). Start the engine. You should get a voltage reading that increases with engine rpm.

If all of the above checks out, then the tach may have a problem. Also make sure that the tach has a good ground.

John
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