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MG MGB Technical - Do horns have <10 Ohms resistance?

Having gotten my headlights working thanks to your excellent advice, I'm now trying to get the twin horns on my '68 BGT to work. When the hornpush is not pressed, the voltage at *both* terminals (pink and pink/black wires) of both horns is 12V. When the hornpush is depressed, the voltage at *both* terminals of both horns drops to 0V. Interestingly, both horns appear to have a resistance of <10 ohms, which explains the above behaviour, I guess.

Does this mean my horns are broken? :-) A resistance that low seems very suspect to me. The car did pass its MOT a month ago though, aren't horns supposed to work for that?

Thanks for any light on this matter,

- Confused Matt
Matthijs van der Meer

The horns draw quite a lot of current, so 10 ohms each (which means a little over 2 amps) sounds about right. If the feed is going to 0V when the button's pushed, most likely the connections on the fusebox are dirty and aren't letting that much current flow. It's the purple wire that you're looking for, give its connection a clean (and that of the fuse too) and you'll probably be okay.

My right indicator stopped working today. Left one's fine, just not right. Ho hum, hand signals it is...
--
Olly
Oliver Stephenson

Horns can fail --and be revived again. Usually they get exposed to dirt and water. Check out your dog-eared copy of the DIY Restoration Guide for more info.
R. L Carleen

This thread was discussed between 29/05/2003 and 30/05/2003

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