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| I have an older model with no gauge. just the red light. No light flash or pulsation. A couple of times it would flash once when switched on. Will not do anything now. The parmak battery is 2yrs old but is showing 6.67v . Had another battery so I tried it also. 6.78v and no results. Any ideas on what I need to look for if I grind the rivets off and open the box? Is it worth putting a board in and where is a good place to get one.? Thank you
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