Tracing electrical problems can often be a long, drawnout process. This 1999 Ford Mondeo was in the workshop because the heater blower motor was not operating. It was also noted that the airconditioning switch – which is part of the blower switch – was not operating either.
Removing the control panel with a view to possibly having to fix the switch panel, we discovered that there was no power to the switch pack. This meant we needed to trace back along to the source of the problem. Dropping down the fusebox, we established that power was going in, but there was no feed out to the blower motor and switch panel. After prodding around with a voltmeter, we suddenly heard the blower fan roar into life.
We had fixed it, but for how long? It was pretty evident that the fusebox was the problem but, try as we might, the newly restored connection could not be broken again. After explaining the situation to the owner, he was quite happy to have the vehicle back on the condition that it would need a new fusebox if the problem reoccurred.
After a prod around inside the fusebox, the connection was restored.