Tach install on Merc 500 Thunderbolt

sc00ter78

Seaman Apprentice
Joined
May 26, 2009
Messages
31
Re: Tach install on Merc 500 Thunderbolt

Had the boat in the water yesterday and tested out the new rectifier along with my old one and both work.

Tried the new tach on setting #2 and the needle jumps around and on setting #6 the needle flutters at around 100 to 200 RPM's above normal.

Lastly I put in the old origanal Tach and the needle stay level with all RPM's.
So I guess the tach may be the problem although it is new from Mercury.
The rectifier charges the moter fine.

Depth sounder works too, evn put it on it's own switch.

Thanks to everyone who helped me with this problem. I have learned lots throughout all this.

I think that will be the last of the posts from me on this issue. Time to look for a new/used boat. Been looking at the 50HP Evinrude E-Tech on an aluminum. (Starcraft, Polar Craft, Misty Harbor, Alumacraft, Smoker Craft)
 

sc00ter78

Seaman Apprentice
Joined
May 26, 2009
Messages
31
Re: Tach install on Merc 500 Thunderbolt

After talking with the staff at Mercury I found out the Tach I have is for a Lightning ignition, not the Thunderbolt ignition. That was the cause for the jumping.
 
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