Other thoughts as to why Tacho stops

[Rosscoe]

Hi all, I have a 1993 Johson 120, I have read the relevant posts here re the regulator/rectifier and have done what has been suggested to test it.<br /><br />With the motor not running the Multimeter read 12.48/12.5 volts, with the motor running at 1500rpm the reading was 13.8/13.9 volts, with the rpm at 2000 the reading was the same, now, while I was testing, the tacho stopped working but the volts remained the same, there was no drop at all in charging volts.<br /><br />From this can I assume the reg/rec is OK???<br /><br />What I am led to believe is that there may be a loose/corroded connection in the control box, would this be so??<br /><br />If so, has anybody pulled one of these things apart, and where do I look for the wire and or connection, and any pitfalls I should aware of when opening it up??<br /><br />All thoughts appreciated..<br /><br />Rosscoe

 

[Dhadley]

Re: Other thoughts as to why Tacho stops

Welcome!!<br /><br />One real quick easy way to bypass all the wiring is to run a temporary wire fron the grey output lead of the reg/rec to the tack. If you have the tach now you know the reg/rec is OK and there is a break or loose connection from the reg/rec grey output wire forward.<br /><br />If the tach doesnt work its either the reg/rec or the tach itself.<br /><br />The needle should jump slightly when the key is turned on indicating the power and ground to the tach is OK.

 

[Rosscoe]

Re: Other thoughts as to why Tacho stops

Thanks for the quick reply!!<br /><br />Having had the boat for only a few years I am still finding my way around the engine and am starting to do a few more things myself.<br /><br />Can you tell me where the reg/rec is located?, I think its below the black box between the V. Is there an easy spot to find the grey out put lead?<br /><br />Quote: The needle should jump slightly when the key is turned on indicating the power and ground to the tach is OK.<br /><br />Is this all the time or only when doing this test?<br /><br />Sorry if my questions sound a bit dumb, but as I said, I'm still finding my way..<br /><br />Cheers, and thanks again, Rosscoe

 

[voodoo]

Re: Other thoughts as to why Tacho stops

My tach stopped working and I just about wet me knickers.. it was only the connector at the shift control box was loose. (a 3 wire plug assy)