Jump to content

    If you want access to members only forums on HSO, you will gain access only when you Sign-in or Sign-Up .

    This box will disappear once you are signed in as a member. ?

Battery Voltage question

Whopper Stopper

Recommended Posts

I have searched the archives and can’t find an answer to a battery question so I will ask it here.

I have an o9 Grizzly 700. The battery is original, and seems to start the ATV just fine. I mounted a Hummin Bird 788 on the ATV. The 788 is a little touchy to voltage drop. What I have found happening of late is when on a lake when the temp are cold the 788 keeps turning off.

The battery when in the garage shows 11.5 volts. Does anyone know what the voltage should be from a battery in good condition?

I am guessing when outside the voltage is less than 11.5 (have not tested that yet) and as a result when driving on the lake the 788 keeps shutting off. I wanted some feedback from you people before I just go and drop $100.

Thanks as always for any tips or comments.


Link to comment
Share on other sites

It looks like your battery is on the way out. You can put a charger on the battery to see if it comes up to 12.6 volts, maybe something is wrong with the charging system on the 4 wheeler.

Link to comment
Share on other sites

Make sure to check the battery when totally disconnected from the machine to isolate anything dragging the voltage down, if you still read 11.5 volts at full charge. Take the battery to an autoparts store, they can load test it for you for free.


Link to comment
Share on other sites

If the battery reads only 11.5V after charging and allowed to stabilize, there isn't much point to get it load tested.

You can also check the charging voltage. Don't know the exact spec. for that machine but typically, the voltage on the battery with the engine running and revved up should be something on the order of >13V and <15V.

Link to comment
Share on other sites

YUASA are very good batteries. The only other MF battery I would use is a Interstate. The machine should put out about 13.5-14.2 volts. 09' Grizzly 700's had a different crankcase cover than 07'-08' that holds more oil for cooling the stator. I have never replaced a stator or reg/rectifier on a 09' and newer grizzly.

Also one thing I see folks do with batteries is always keep a battery tender on the unit. Not a good thing unless your charger has a desulfation mode. A smart charger like an Optimate or Ctek work much better.

Link to comment
Share on other sites

Join the conversation

You can post now ↓↓↓ or ask your question and then register. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use and Privacy Policy. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.