How to Build a DIY 12V Power Supply from an Old PC PSU | Fish Finders, Car Accessories, More!

Looking for a simple way to power your 12V fish finder, car accessories, or LED lights without hooking up a car or boat battery? In this video, I’ll show you how to convert an old desktop computer power supply (ATX PSU) into a safe and stable DIY 12V power supply for your workbench or garage.

Whether you’re testing a Garmin, Humminbird, or Lowrance fish finder, powering dash cams, running LED strips, or building a test bench for your next 12V project — this method works.

💡 What You’ll Learn:

How to modify a PC PSU for 12V output

How much current you can safely draw

What you can power (fish finders, car gear, lights, and more)

Safety tips to avoid damaging your electronics

🛠️ Tools & Parts Used:

Any ATX Power Supply (300W+ recommended)

Binding posts or banana jacks

Multimeter

Electrical tape / heat shrink

Basic wire tools

🔋 Ideal for testing:

Garmin LiveScope

Humminbird Helix & Mega Live

Lowrance HDS, Elite FS

12V car audio

LED light bars and dash cams

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