Easy Tach Question
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From: Vallejo, CA
Easy Tach Question
Hi,
Easy newbie question. I am hooking up a tachometer to my 390. I need to attach it to the coil negative post. I can not find the label saying "tach," "neg", or anyother markings. All I can find is the main wire going into the center, a red wire going from one post of the coil to one side of the distributer, and a black wire going from the other post into the side of the distributer. So which one is the negative post?
Thanks to all who can help.
Easy newbie question. I am hooking up a tachometer to my 390. I need to attach it to the coil negative post. I can not find the label saying "tach," "neg", or anyother markings. All I can find is the main wire going into the center, a red wire going from one post of the coil to one side of the distributer, and a black wire going from the other post into the side of the distributer. So which one is the negative post?
Thanks to all who can help.
Laughing Gas
Joined: Nov 2000
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From: tulsa
there should be a wire that comes from the ignition switch to the coil, this wire is connected to the positive side of the coil, the other side is the negative there should be a "-" on the coil to indicate negative.
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From: Long Island USA
Originally Posted by fastmover
All I can find is the main wire going into the center, a red wire going from one post of the coil to one side of the distributer, and a black wire going from the other post into the side of the distributer. So which one is the negative post?
The black wire going to the distributor connects to the points inside the distributor - that's the NEG or (-) side of the coil. That's the one that goes to (probably) the green wire to the tach.
Don't take the +12V for the tach from the + side of the coil (red wire).
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Posting Guru
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From: Vallejo, CA
I just installed the tach. I used the black wire for the coil. I attached the power into the fuse panel open slot beside the fuse. I attached the white wire (for the tach light) into the head light switch, and I grounded the black wire of the tach to the inside fender apron. I mounted the tach at 2 o'clock on the steering column to avoid blocking other gauges. It is working fine. I am glad to finally being able to tell what rpms I am at. Thanks to everyone for your help.
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