Amp Gauge: What's it measure?
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Cheers, Ian
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The tell-tale arm is especially handy in situations like Alex's when someone else is driving your car!
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With modern electronic ignitions, wouldn't it be easy to include an ignition cut-out at the red line, rather than rely entirely on a painted on line?
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With modern electronic ignitions, wouldn't it be easy to include an ignition cut-out at the red line, rather than rely entirely on a painted on line?
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My driver keeps forgetting that I have a tell-tale installed...
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"Hang on a minute lads....I've got a great idea."
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Mini's are like buses they come along in a bunch
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"Hang on a minute lads....I've got a great idea."
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^
Unless you were bored Dan, that was a waste of typing as he'll pay no attention to it at all.
It's like trying to educate effluent.
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"Hang on a minute lads....I've got a great idea."
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From memory, the late model Caerbont tachs have two sense wires to connect to the ignition system. You are supposed to chose one for points, the other for electronic ignition. When you look to see which wire your tach is using, don't hesitate to try the other sense wire... in spite of what the instructions say. You won't hurt anything. You may find you need to try all four possible combinations of switch settings and wire connections.
I would also send an email to Caerbont explaining what is going on. Tell them what ignition system you have, what sense wire is connected (and where) and what your switch settings are. They can be slow responding but they do answer emails.
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Wiring one of those rev-counters in is a doddle, and only requires 2 maybe 3 wires to do it with an additional one for the internal light.
Check that there is a white/black wire from the gauge to the -ve terminal of the coil.
Look for a white wire to switched live.
You may have a black earth wire going to the body.
There should be red/white wire going to the bulb holder.
If all these are in place then you may have a dodgy gauge.
If it has been wired using the incorrect coloured wires then I#d be getting grumpy with the professional electrician.
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I'm trying to relate it's behavior w/ the reading in the voltmeter. The tach works fine for the first 5 - 20 mins after starting in the morning (voltmeter reads 12.9v). After that it gets erratic (voltmeter reads 13.5). Sometimes it seems to read double, sometime half, sometimes it's all over the place. It freezes when the headlights are on. Makes me think it's voltage related. My regular Mini mechanic says he's dialed in my voltage regulator and it's working fine. I'll trace the wires and double check the connections next. If the wiring is correct and the connections are in order, what are my options beyond exchanging the tach for a new one? If I do swap it for a new one and the problem remains, what next?
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However, you have posted a picture of a voltmeter, not an ammeter. A voltmeter will show the battery voltage when the key is in the run position and the engine is off. When the engine is running the voltmeter shows the car's operating voltage. If the alternator is working and the battery is taking a charge, the voltmeter should read 1V to 2V higher than it reads when the engine is off.
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