Odd tach and AFM gremlin...any ideas??

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dusterdoug

dusterdoug

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Auto meter tach and A/F meter plugged into the heat/ac fuse...

Have a signal to both when key is the on position. Once car is running I lose the signal to both. But...heater fan still works.

I ran a jumper wire from both direct to the battery and they work as they should.

Could this be a bad ignition switch?? It is a repop, and each worked a couple of weeks ago and now this.
Thoughts??
And thanks in advance!!
 
I'm not sure I'm following. You are looking for a key on power source? and you tapped into the heat/ac fuse?
There are multiple other sources for key on power under the dash.

I don't think you have a bad ignition switch, I think your source for 12V is a poor one.
 
If other accessories work it's not the switch. Might just be bad fuse clips, wire connections to them or even a bad fuse
 
Turns out the new repop ignition switch is bad. When the car is running and I wiggle the key, AFM and tach are live. If I let go of the key, I lose them.
 
66 Valiant wagon said:
I'm not sure I'm following. You are looking for a key on power source? and you tapped into the heat/ac fuse?
There are multiple other sources for key on power under the dash.

I don't think you have a bad ignition switch, I think your source for 12V is a poor one.
Click to expand...

I had planned to move them to the ignition switch itself. That source was a quick plug in just to for the initial start up, timing/carb adjustments, etc...
 
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