Tach and purple wire

[pursuit2460]

I have read alot of the previous thread on the purple wire issue. I have a 93 johnson 225. I replace the stator, power pack, timmer base, and rec/reg. Today I went to turn on the engine and started just fine. Couple of mins. later I look at my tach and its at zero. Turn off the engine turn it back on and still no tach. I check the battery with a volt meter and it was charging at 12.24 as I accelerated the engine the voltage went up and still no tach. I looked one more time and the tach was working and the voltage jump to 13.05 at idle. Question my rec/reg came with the purple wire and I dont have it connected should it be connected and if so where. Also I have 3 purple wires under my center console. 1 goes to the ign. switch. 1 is on the horn. And the last one plugs in with the wires to the tach. Thats the purple wire that I dont have connected. Thanks

 

[OBJ]

Re: Tach and purple wire

If this is coming off the control box connection, the purple wire supplies the 12V needed for the tach to work. It should connect to the "I" on the tach. At any rate, you need 12V to the tach for it to work.

 

[pursuit2460]

Re: Tach and purple wire

I have all my gauges interconnected with a pos. wire from the batt. switch. Meaning when I switch my batt. switch to 1 or 2 all my gauges have power. Will this setup work the same. Any comments on what I experianced today. Thanks

 

[npd4432]

Re: Tach and purple wire

My tach was doing the same thing, my purple wire is for the backlight on the tach. Make sure your bulb is good on all of your gauges if you have them interconnected. When I was turning on my lights my tach would go dead, and the other gauges would peg, turn the lights off, all was well. After a while it all went dead, it turns out my tachometer had a bad solder internally, got a new tach, all is well. Gray wire is for the sending unit, red wire switched 12V+, Black wire is the bat. negative and the purple wire is for the backlight. Try fooling with the lights, bulbs or isolate the tach. When I had my problem, when the purple wire was taken off, the tach would not work. Hope this helps.