Frequently Asked Questions

Horner Bros. (Auto Electricians) Ltd.

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Listed below are the answers to a few of the questions we are frequently asked.

If you have a question that is not answered here, please contact us.

General
  • If the battery warning light comes on, it does not mean that your battery is faulty. There is more than likely a problem with the charging system on the vehicle, so don't just rush out and buy a new battery.
  • If your indicators flash too fast on one side only, check the bulbs. You will probably find that one is blown.
  • Please DO NOT check to see if your alternator is charging by jump-starting the engine, then removing a battery lead to see if it stalls. This causes a voltage spike, which will damage the diodes. So if your alternator wasn't faulty before, it will be now.
  • If the starter motor sounds like a machine gun one morning, the battery is probably flat. Try jump-starting the vehicle, then driving round to us to find out why the battery has failed.
Alarms/Immobilisers
  • If this won’t “de-activate” by pressing the button on the key fob, you may just need a new battery in the fob. It’s worth keeping one handy!
Rover Metro/100
  • The main ECU can develop a fault causing the battery to go flat overnight. We have a standard "fix" for this, costing £75.00, much cheaper than a new ECU costing £350.00!!!
Vauxhall 1.7TD ("Isuzu") Engine
  • As fitted to the Astra, Cavalier and Combo, 1992 to 1996. If you have recently changed the alternator but the warning light remains on, check the relay that controls the warning light. Chances are that it is damaged. The later type of alternator does not use this relay, but unfortunately cannot be fitted in place of the earlier type.