I want to tell you a story about why I think tow operators and electricians need to talk to each other more often.

A few summers ago I got a call from a friend of a friend who ran a small impound lot outside of Mesquite. He was getting electrical bills that didn’t match his usage, and his security lighting kept tripping breakers in patterns he couldn’t explain. He’d called two electricians who’d looked at the panel and said it was fine. He wanted a third opinion before he started replacing fixtures.

I went out on a Saturday. I’d never been to a tow yard before, professionally. It’s a particular kind of place — chain-link perimeter, gravel lot, a few hundred cars in various states of “we’ll figure out what to do with them,” a small office trailer, and a metal pole barn for the trucks.

The owner was friendly. Showed me his bills, his outage history, his security camera footage where you could see the lights blinking in sequences that no normal load pattern would explain. Pulled the cover on the service panel for me. Walked away to take a call.

I started my diagnostic.

What I found

The panel itself looked fine. A little dusty, a few burned dead-front screws from somebody having torqued them too hard at some point, but the connections were solid, the breakers were the right size for the conductors, and the grounding electrode conductor was where it should be. Nothing in the panel explained what the owner was describing.

So I started tracing.

The service entered through the meter on the south wall of the office trailer. Standard. Underground feeder from the utility transformer about 100 feet away. Clean install at the trailer. Conduit from the meter into a sub-panel inside the office. That sub-panel fed lighting on the perimeter of the lot — sodium vapor fixtures on poles, the kind that have been mostly replaced by LEDs these days but still exist on a lot of older commercial properties.

Twelve lighting fixtures. I traced the circuit from the sub-panel out to each fixture. The first eleven were fine. The twelfth was the one in the far back corner of the lot, mounted on the chain-link fence post, illuminating the gate to the back impound section where the high-value vehicles were stored.

The conductor from the sub-panel to the twelfth fixture had been spliced. Not in a junction box. Not even underground. The conductor came out of the conduit run, went into a section of metal cable tray that ran along the inside of the chain-link fence for maybe sixty feet — the previous owner had apparently used the cable tray and fence as a combination support and conduit substitute — and then back into a fixture box at the far light.

The cable tray was bolted to the chain-link.

The chain-link was un-grounded.

And the original conductor, where it left the proper conduit, had been spliced with a wire nut and three pieces of electrical tape. The hot conductor. Sitting against the metal of the cable tray. Through eight summers of expansion-contraction, the insulation had cracked. The hot conductor was making intermittent contact with the cable tray, which was bolted to the chain-link, which was the perimeter of half the impound yard.

Half the back of the yard’s fence was sitting at potential whenever the lights were on. The lights were on dusk to dawn, every night, for the two years the current owner had owned the property.

What that meant

If you’ve spent any time in trades, you can guess at the implications. I’ll spell them out anyway because the owner couldn’t, and I think that’s the point of this story.

The fence was at potential. Not full 120V — there was enough resistance in the chain-link itself, the bolts to the posts, and the cable-tray-to-fence connection that the actual measured voltage on a representative section of fence was around 40-60V. Enough to feel. Enough to hurt if you grabbed it while standing in wet grass with bad gloves.

The intermittent breaker trips made sense now. When the cable-tray contact was stronger (hot days, expansion), more current was leaking to the fence and the breaker would eventually catch it. When the contact was weaker (cooler nights, contraction), the fence still had potential, but the leakage current wasn’t enough to trip the breaker.

The electrical bills made sense. The owner was paying for current that was leaking to ground through his fence, his soil, and back to the transformer. Not a huge amount on a per-hour basis. Significant over two years.

The security cameras showing lighting patterns that didn’t match the load? When the leakage was bad enough on a given night to trip the breaker, the lights would cycle as the homeowner’s GFCI-protected sub-circuit (which fed both the lights and the cameras’ backup power) cycled through reset attempts. Once I knew what to look for, it was obvious in the footage.

The thing that really stuck with me was the dogs. The lot owner had two German shepherds that lived on the property. They were trained to patrol the lot at night. He told me, after I explained the situation, that he’d noticed the dogs had stopped going to the back corner of the lot a few months ago. He thought it was age. They were avoiding the fence.

Why I’m writing this for a publication that covers towing

A few reasons.

If you operate a tow yard, an impound lot, an auto auction, a salvage yard — any commercial perimeter property with electrical service running to perimeter fixtures — get the property inspected by a licensed electrician at least once after you take ownership. Not the kind of inspection the prior owner’s electrician did. A real one, with a tracer, walking the perimeter with you.

The kind of installation I found is more common in older commercial properties than I think people realize. The pattern is: a property owner needed a circuit run to a far light. They didn’t want to pull a permit and trench properly. They improvised. The improvisation works for years, until it doesn’t.

If you operate at properties like this — driving in and out at all hours, hitching to vehicles, handling metal, sometimes in wet conditions — the cost of an undiscovered electrical fault on the perimeter is real. The dogs in this story were smarter than the owner. They knew. Trust the dog logic. If something feels off about a part of the lot, treat it as suspicious until you’ve had it checked.

The owner in this story spent about $2,800 to fix what I found. Trenching, proper conduit, fence grounding, panel updates, the works. He was the cheapest possible fix because nothing had gone bad enough to cause a fire or an injury. The alternative outcome — where he didn’t find it and a tow driver in wet boots grabbed the fence in the rain — was a different price entirely.

If you’ve never had your tow yard properly inspected by an electrician, schedule it. If the inspector tells you it’s fine and you have reason to doubt them, get a second opinion. The pattern in this story is that two prior electricians had looked at the panel and said the panel was fine. They were right about the panel. The panel wasn’t the problem.

Stay safe out there.

— Mike