voltage readings

[Last Call]

i have a 1994 70hp Yamaha the volt meter on the dash reads 16 volts and the one on my Hummingbird reads 12.5 How can I tell which is correct?

Thanks

[almetelo]

use a multimeter and check voltage at battery

[boscoe99]

And if the voltage at the battery, with the motor running, reads 16 volts, then I would suspect that you have a significant voltage drop issue to the fish finder that needs to be addressed.

However, for some reason not known to me, electronic devices seem to always report a voltage that is lower than it really is.

[FLCoyote]

Voltage Drop

I had a similar issue and after lots of troubleshooting found that the main accessory cable from the battery was separating due to corrosion. I found it because it finally just separated completely. My advice is to check the terminal end of the main accessory with and replace the connector just to see if that's the problem.

FLCoyote

[Last Call]

thanks everyone, going to the cottage this weekend and try your suggestions and will report back.