# Orion-Tr Smart Non-isolated DC/DC charger not charging battery

**URL:** <https://community.victronenergy.com/t/orion-tr-smart-non-isolated-dc-dc-charger-not-charging-battery/62619>\
**Category:** DIY\
**Tags:** dc-dc\_charger, diy\
**Created:** [9 September 2026 07:43 UTC](https://community.victronenergy.com/t/orion-tr-smart-non-isolated-dc-dc-charger-not-charging-battery/62619 "2026-09-09T07:43:40Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Muligrub](https://avatars.discourse-cdn.com/v4/letter/m/13edae/32.png) [@Muligrub](https://community.victronenergy.com/u/Muligrub)\
**Post date:** [9 September 2026 07:43 UTC](https://community.victronenergy.com/t/orion-tr-smart-non-isolated-dc-dc-charger-not-charging-battery/62619/1 "2026-09-09T07:43:40Z")

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Help with an Orion-Tr Smart Non-isolated DC/DC charger.

The unit has been installed and working fine for about 5 years. Recently it stopped charging and the green LED began flashing 17 times, then staying solid for around 5 seconds before repeating. At the time of the fault, input voltage from the alternator was approximately 14 VDC, but there was no output voltage.

I purchased a new Orion-Tr Smart Non-isolated DC/DC charger and installed it. Unfortunately, I’m seeing exactly the same behaviour. What this LED pattern indicates and suggest any likely causes or troubleshooting steps?

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**Author:** ![system](https://europe1.discourse-cdn.com/victron/original/1X/21a9a7b5db7c6339715f993568736a7053199995.png) [@system](https://community.victronenergy.com/u/system)\
**Post date:** [9 September 2026 07:43 UTC](https://community.victronenergy.com/t/orion-tr-smart-non-isolated-dc-dc-charger-not-charging-battery/62619/2 "2026-09-09T07:43:41Z")

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**Author:** ![system](https://europe1.discourse-cdn.com/victron/original/1X/21a9a7b5db7c6339715f993568736a7053199995.png) [@system](https://community.victronenergy.com/u/system)\
**Post date:** [9 September 2026 08:42 UTC](https://community.victronenergy.com/t/orion-tr-smart-non-isolated-dc-dc-charger-not-charging-battery/62619/3 "2026-09-09T08:42:51Z")

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**Author:** ![pwfarnell](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/pwfarnell/32/2341_2.png) [@pwfarnell](https://community.victronenergy.com/u/pwfarnell)\
**Post date:** [9 September 2026 08:46 UTC](https://community.victronenergy.com/t/orion-tr-smart-non-isolated-dc-dc-charger-not-charging-battery/62619/4 "2026-09-09T08:46:59Z")

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I do not know what the code means, the closest in the manual is bulk/ absorption charging.

You need to do some basic system checking with a multimeter if there is no voltage on the output, it should always see the battery voltage of the battery being charged as a minimum. You need a multimeter to check all wiring for loose connections, blown fuses or breakers/ switches that could have failed. Do this on the positive and negative connections. On a vehicle vibration often results in loose wiring.

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<div class="post-metadata">

**Author:** ![Muligrub](https://avatars.discourse-cdn.com/v4/letter/m/13edae/32.png) [@Muligrub](https://community.victronenergy.com/u/Muligrub)\
**Post date:** [9 September 2026 19:48 UTC](https://community.victronenergy.com/t/orion-tr-smart-non-isolated-dc-dc-charger-not-charging-battery/62619/5 "2026-09-09T19:48:13Z")

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Have checked with a multimeter, with battery connected it reads 12.3v, battery disconnected 14vdc. It’s like the supply is switching off for some reason. The battery charges fine of the mains charger.