You grit your teeth and wait for the big bang...but , most times, everything seems to remain intact.
We had a customer earlier this week who had hit a big bump in the verge with his caravan some months ago, when trying to avoid an oncoming and unyielding timber truck. He stopped shortly afterwards and inspected his unit, which seemed to have escaped with no damage.
On arriving at a local site at the weekend, he connectedhis hook up but the miniature circuit breaker that supplied his charger, lights and water heater just kept tripping, leaving him unable to charge his battery.
On inspection we found the PCB of the charger looked like this
and what should have been the core of the transformer looked like this-
We suspect that the core fractured when he was forced off the road but the main parts stayed attached to the transformer for months, until his visit to the area, when one of the broken parts caused a short between a transformer terminal and some of the components on the PCB.
At least the protective devices worked and prevented any major issues and, to be honest , it would have been be a very difficult issue to identify, prior to it causing the charger to fail. So, in the words of Inspector Clouseau, you should always expect the unexpected...........