New batteries, testing connections in the battery housing with a volt meter, removing the SMS device and cleaning the copper flanges on the card and the housing with a Q tip. There was a small amount of corrosion in the area.
The on/off switch on these were problematic.. so you might want to look at the linkage and switch before digging deeper, below.
Corrosion is a problem. If you can clean it up, you should. If the corrosion is a result of a leaking battery, you should disassemble the device as far as possible to allow access to areas that have been contaminated with battery acid. I like to use a q-tip dampened in a mixture of baking soda and water (about 10% baking soda and 90% water). Battery acid conducts electricity and must be removed. Anywhere it is results in changes in the values of components and can cause a great deal of problems.
You may also be able to exchange for a modest sum with Garmin for one of their rebuilt units - if available.
Good luck!
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