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I am hooking up a tach on a 2009 sportster. I need to hook one wire from the tach to the negative side of the coil. Which wire on the coild is the negative white, since there are more than two?
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Sounds like you are capable of working on your own machine. Get the Harley Service Manual for your machine. Best $30 investment you can make. Else, with all engines I've worked on, if you connect your instrument to the "wrong" coil terminal the worst that happens is you get no RPM reading; go to the other terminal.
The green wire from the tach goes to the negative side of the coil or if its an HEI distributor it will connect to the left of the hot wire going. to the distributor.
The tachometer is an electronic tach and gets it's "pulses" from the ignition coil. The older bikes had a pink wire that went to "negative" side of the coil. The negative side of the coil is the side the electronic sensor plate in the ignition cavity on the right side of the engine connects to.
Most aftermarket tachometers will employ a 3 wire system. A "power" wire, a "signal" wire and a "ground" wire. On a stock Sportster's ignition coil there will be 2 terminals/posts. 1 post will have a set of white wire on it the other a blue or pink wire. White is switched 12VDC (vehicle power) and the blue/pink is the secondary side of the coil (signal). I'd really need more information to be most helpful.
If you have a good look at the coil, it should still have a positive and negative sign on it somewhere. Try not let the extra wires confuse you too much. These are for the ignition module in the distributor. let me know if you need further clarification after you've had a look.
Red wire would go to ignition battery, the black to ground. The third wire, probably green or blue, goes to the negative side of the ignition coil. Is there a wire for dash illumination?
Tachs are coil sensing. Since you have a start problem, chk tach wiring at coil and coil wires.
If all is good, Locate or identify the tach wire and disconnect it. The tach wire should be on the negative side of the coil. If bike starts without tach wire hooked up, Your tack is more than likely the culprit. If bike stll won't run, chk for power to the coil and any possible fuse in ignition circuit. Under the seat I think. Good Luck
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