Car engine sitched of and warning light flashed alternator worksh
I was driving my car and everything was fine... I was going at 5mph in a car park when all of a sudden the engine cut out and a warning light flashed saying alterator workshop.... after a few seconds the light went off and when i switched the engine back on the car was running as normal... what coukd the problem be? my car is a vw golf
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it is possible for a altenator to go like that , how ever it ould be the battery has failed as well. the best way to diagnose a charging or electrial issue is with the use of a simple multimeter. set the multimeter to the 20v dc scale with no engine running put the red probe to the positive of the battery and the black to the negative terminal the multimeter should read some where over 12v consider the car isn't running so the altenator at this stage is doing nothing. start the vehicle in park or neutral with hand brake on and peform the same procedure. ideal voltage with engine running would be 13.6 to 14.5 with no head lights on . this is a very simple test to establish if the altenator is in fact at the cause of the problem, if the altenator is operating in that range it is fair to say it is working fine. if the voltage is reading over and high 15v the voltage regulator has packed it in and now the battery is at risk of being cooked from over charging, there are a lot more complexed tests that can be peformed but this should get the answer of whats going on. hope you find this helpful.
fully charge battery and make sure everything switched off i.e rear window demist etc and take it for a run to get it up to tempature then park up rev engine at fast idle approx 2750 rpm for 180 seconds then take foot off throttle and allow to idle for 30 seconds this will clear your catalyst and get it up to the 600 degrees needed for it to operate properly this should remove the engine warning light
I have a similar problems on my 2005 9-3. It has developed a number of minor electical issues. including dial and false warning light triggers. I have fixed most of them by simply going round the car disconnecting the electical connectors and spraying "switch cleaner" (Maplin or Radio Shack). The only problem I have left is the rev counter occasionally starts reading high, removing the fuse (end of dash panel - 4th fuse down) for about 30s with engine off normally resets everything back to normal. Hope that helps.
If the motor gets hot and cuts off and will not start for a period of time the problem would be the crank sensor. The sudden cut off and starting right back up can be due to dirty battery cable connections. Remove them from battery and clean all three of them with a wire brush and replace both bolts.
I am not positive about my answer but I figured I would give my feedback anyways. It is possible that your alternator might be going out. In my experience, I had a '95 Maxima where, as I was driving, the battery and brake light would come on for a second and then it would turn off. A couple of days later, I needed a jump start. After driving down the road and after the car shuts off on me again (even after the jump), I realized that I needed a new alternator. Sure enough, the alternator solved the problem.
It sounds like your battery has had it! IF you can jump start it, try to go to a battery store or a service garage to have your battery and alternator checked. If no other warning lights were previously on, it is possible that the battery just up and died. Otherwise, I would suspect the alternator.
Also, make sure teh parking brake is NOT engaged while driving.