All cars on the road today have a large amount of wiring and modules that talk to each other every time you start your vehicle. Its a complete data network which keeps the car or van running as it should. When an electrical component fails it can cause nothing but problems. With new vehicles past 1996 they have a diagnostic port which allows the use of a specialist diagnostic machine to read the codes stored in the vehicles computers.
Auto Electricians can also repair wiring or damage on your vehicles wiring harness should the looms get damaged while your driving your vehicle. Wiring repairs can be a simple part of the loom needing replacement or a complete new set of wires run to make the vehicle work again. With auto electrical you should allow enough time for fault finding due to electrical faults never being a quick job on motor vehicles.
When trying to find an Auto Electrician you should look for a approved engineer that will find and repair the fault as quickly as possible, with full on board testing equipment such as multi meters and diagnostic machines you can quickly return to having a working vehicle.