ByStickel Posted July 17, 2015 Report Share Posted July 17, 2015 When I dug into my wagon's wiring issues (before the car ran) I noticed that the factory, orange, 3-wire tach had the black wire to ground, the Green to 12V, and the Green/Black to the negative side of the coil. I reversed the two, putting Black to 12V (which felt very wrong) and the green to ground. I finally got the car to start and the tach doesn't work. I did not put the green and black wires back to where I found them. Info on the web is contradictory, regarding the wiring. Is it fried? If it's fried, what part fails? Even if I have to replace items on the board, I will fix this tach. Quote Link to comment
67_1600 Posted July 17, 2015 Report Share Posted July 17, 2015 Green should go to power (switched or not), black to ground and the white wires going back to the engine compartment and hooking up more or less to the positive side of the coil. Like you, I found much of the information contradictory when searching. Here is a link to another thread that might be useful and a crude image showing how the white wires should connect: http://www.the510realm.com/viewtopic.php?f=32&t=25745&hilit=tach 1 Quote Link to comment
ByStickel Posted July 17, 2015 Author Report Share Posted July 17, 2015 67_1600, Are you talking about the pre-'73 tach? Mine only has 3 wires: Black, Green, and Black/Green. Quote Link to comment
67_1600 Posted July 18, 2015 Report Share Posted July 18, 2015 67_1600, Are you talking about the pre-'73 tach? Mine only has 3 wires: Black, Green, and Black/Green. Minor details - sorry about that. Quote Link to comment
ByStickel Posted July 18, 2015 Author Report Share Posted July 18, 2015 Thanks, all. UPDATE: reversing the ground and 12V did not fry my tach. I swapped the wires and it's working fine. Whew. 1 Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.