Fixing a DC Electrical Short in LED Lights

Fixing a DC Electrical Short in LED Lights

In this episode of SV Seeker, we’re tackling a strange issue with the anchor light and headlight on our boat. Both lights come on together, regardless of which switch is activated. We suspect an electrical short in the lighting system. Join us as we investigate and repair the short, while sharing tips for working on boat electronics.

The Problem

Upon closer inspection, we notice that the anchor light (360-degree view) and headlight (225-degree range) are wired together. Both lights receive power from a common ground wire and individual wires for each light. The problem becomes apparent when we test the system:

We turn on the headlight switch, and both lights come on. We then turn on the anchor light switch, and both lights also come on simultaneously.

It’s clear that there’s a short circuit in this setup, causing both lights to activate whenever either switch is engaged.

The Investigation

To find the source of the short, we begin by testing each wire individually. We use a multimeter to check for continuity and voltage. We’re hoping that the short occurs between one point and the lights, allowing us to identify and rectify the problem easily.

The Fix

After examining all wires and connections, we decide to cut the wire harness between the headlight switch and the junction point. Our thinking is that if there’s a short between this section and the lights, it should become apparent upon reassembling the system.

Testing

Once we have reconnected all components, we proceed to test the system again. We turn on each light individually and check for proper functionality. We also use a conductivity tester to ensure that there are no hidden shorts causing issues.

The Final Steps

Having fixed the electrical short, we take some time to tidy up our work. We use wire nuts and RTV gasket maker to seal the connections and protect against future shorts. Our final test confirms that both lights are working as intended.

The Conclusion

What started as a perplexing issue has been resolved thanks to thorough testing and a systematic approach. It’s always satisfying to resolve an electrical problem on the boat, especially when it results in better performance for future trips.