The 1999 Jeep Cherokee ignition coil used a black wire for the negative wire. The negative wire should be on the left post.
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Usually only one wire there, but some are heated O2 sensors, that wire will have 12 volts while ignition is on.
I have a 95 cherokee. had lots of trouble with the coil blowing out till I ran a direct body ground to the coil mount. try changing the coil and running a ground wire from the frame or metal body direct to the coil mount. RW
Your tach wire color is Gray. And it's located at Coil on passenger side of the engine. This goes for 1997 through 2001.
a speaker uses a voice coil a coil copper wire and a magnet and pole to vibrate a cone
AnswerAt the PCM on the driver's side engine compartment. #7 gray wire on the black plug.