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I have a nissan almera in south africa.When i press the horn,the battery light flashes.i changed the relays,the altenator,and checked the fuses,still the same.tested power on the relay circut and shows 12v but when the horn is pressed,it drops down to nothing.Please help

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  • Expert
  • 206 Answers

It sounds like you have a short in the horn button wires, causing it to ground out when you try to use it.

Posted on Oct 31, 2012

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USfalcon
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SOURCE: horn does not work

check B+ in the horn pin and check the ground on the horn if there is B+ and B- just change the horn if there is no B+ on the horn conector replace the relay .
B+ = battrey power
B- = battrey ground

Posted on Mar 14, 2009

tunde007
  • 2382 Answers

SOURCE: 2002 kia Rio Altenator

Hi, the actual output voltage produced by the alternator will vary depending on temperature and load, but will typically be about 1-1/2 to 2 volts higher than battery voltage. At idle, most charging systems will produce 13.8 to 15.3 volts with no lights or accessories on. This can be measured by connecting the positive (+) and negative (-) test leads of a voltmeter to the battery posts while the engine is running.

Possible cause of the alternator not charging includes Slipping or broken alternator belt, Open diode, Open circuit in stator windings, Open charging circuit, Open field circuit, Worn brushes or slip ring and Defective voltage regulator..

Posted on Feb 27, 2011

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