Hey guys, Cooper from Amprex here. I wanted to share a repair I did a few months back on a 2021 SurRon LBX. It’s a great example of how sometimes the real issue isn’t what it first appears to be.
I bought the bike off a bloke who told me the 12V inverter had failed. He’d even had one of our competitors look at it, and they quoted him close to $350 for the repair. The moment I got the bike home, I was straight into diagnosing it.
First step, I plugged in a spare inverter I had lying around to confirm the fault. But the symptoms were identical:
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No lights
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No sport mode
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No horn
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Stuck in eco mode (and with the way I ride, being locked in eco just isn’t an option).
That’s when I decided to check the voltage going to the display. To my surprise, it was showing 60V, when it should have been a safe 12V. That immediately rang alarm bells.
So I started thinking: What if the problem isn’t the inverter at all?
I disconnected the wiring harness, and there it was — the negative wire to the inverter had disconnected from the battery. A simple wiring issue, nothing to do with the inverter itself.
The Takeaway
Not every problem is as expensive or complicated as it first seems. In this case, what looked like a failed inverter was really just a simple wiring fault. At Amprex, we know a thing or two about electric dirtbike repairs, and we always dig deeper before throwing parts (and money) at a problem.
If you’ve got a SurRon, Talaria, or Ultra Bee giving you headaches, it might just be something simpler than you think — and that’s where we come in.