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OMC Tachometer Testing

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MarleyWars

New member
I have refurbished a 1973 fiberglass forester tri-hull and it has a 50hp Johnson on it. One of the last things to do was rewire the original tachometer. I found the grey wire in the OMC Power Pilot control box and wired that to the grey wire (non-regulated output) on the tachometer. I believe the other wire (black) off the tachometer was the ground and wired that to the negative terminal of the battery for testing purposes. I took a volt meter to the grey wire at the control box and started the engine. The volts were all over the place and the tachometer did not move. Does anyone have any ideas on whether my wiring is wrong, on how to test a tachometer a different way, or if that voltage that I saw is the problem?​

https://photos.google.com/photo/AF1Q...cWsRIrabwD7fWU

https://photos.google.com/photo/AF1Q...7nbxT_hGJYXe7c
 
It seemed like it bounced everywhere. That typically seems to be a problem. Where can I look for the irregularity? Back at the motor? Appreciate your insight Boobie.
 
At the power pack or would it be somewhere else? Would the wire be grey too by chance? But what you are saying is that the voltage irregularity shouldn't be happening.
 
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