Thunder dc-dc charger

Submitted: Saturday, Apr 17, 2021 at 17:29
ThreadID: 141540 Views:14531 Replies:7 FollowUps:25
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Just installed 20A Thunder dc-dc charger in tub of Dmax to charge 2nd battery which runs fridge. When I start vehicle it flashes 0%, 80%, 88% then 100% for about 3 minutes and display turns off, no lights.
Is this normal or do I have a problem?
Manual doesn't seem to provide answer
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