Replaced battery, now speedometer not working

robborobborobbo · 07-07-2017, 01:40 AM

I replaced my battery and on the first run out over the 4th, my speedo isn't working. Any quick hints for me to check.

I have some other wiring/electrical issues like my 12V plugs not working too, so I was going to bring into the the shop for an electrical work in the off season. But was hoping that this speedo issue might be a quick fix during the season.

robborobborobbo · 07-07-2017, 01:45 AM

Me again...also, where do i find the circuit breakers in 1996 shabah. Thanks!

pllevine · 07-07-2017, 01:45 AM

Quote:

Originally Posted by robborobborobbo

I replaced my battery and on the first run out over the 4th, my speedo isn't working. Any quick hints for me to check.

I have some other wiring/electrical issues like my 12V plugs not working too, so I was going to bring into the the shop for an electrical work in the off season. But was hoping that this speedo issue might be a quick fix during the season.

The speedometer isn't an electrical device, unless you changed to a GPS based speedometer. It works by water pressure hitting the front of the lower drive. There is a small notch/hole in it and the water is forced into a small hose that runs up the stern drive and all the way to the back of the speedometer. Check to see if the hole or the hose is clogged.....

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robborobborobbo · 07-07-2017, 12:29 PM

Awesome. thanks! so it operates like an airspeed indicator on my plane. that is very interesting.

pllevine · 07-07-2017, 08:24 PM

Quote:

Originally Posted by robborobborobbo

Awesome. thanks! so it operates like an airspeed indicator on my plane. that is very interesting.

It's so close, I sometimes call that hole in the front of a stern drive "the pitot tube"....
Just instead of air, it's water....
They have a really bad history of clogging up. Mine wasn't working, so this forum told me to use a tiny drill bit and twist it BY HAND into the hole and try to clear out whatever was blocking it. It worked and my speedo is accurate to GPS matched speed.

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robborobborobbo · 07-07-2017, 09:28 PM

Sweet. Thanks again!

tbrookens · 07-09-2017, 04:17 AM

Quote:

Originally Posted by pllevine

It's so close, I sometimes call that hole in the front of a stern drive "the pitot tube"....
Just instead of air, it's water....
They have a really bad history of clogging up. Mine wasn't working, so this forum told me to use a tiny drill bit and twist it BY HAND into the hole and try to clear out whatever was blocking it. It worked and my speedo is accurate to GPS matched speed.

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Maybe you need to check the pitot heat?

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