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Alternator resistance

Submitted by robin_pearson on Thu, 30/08/2012
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Hello, does anyone know the specified resistance across the two terminals of the Wipac alternator, as fitted to the 12 Volt electronic ignition conversion? I don't have a spark, and the alternator is my first port of call. First time I've posted something here by the way! Cheers. Robin.

Submitted by colin_sharpe on Thu, 30/08/2012

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The test for alternator rotors is: Between the two terminals, there should be very low resistance, and between either terminal and earth there should be infinite resistance. If your battery is fully charged, you should get sparks even with the alternator disconnected. Look at the wiring, the coil and the Boyer unit.

Submitted by tony_ripley on Fri, 31/08/2012

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Hi Robin,

There is no relationship between the alternator and the ignition.

If you have boyer ignition, the quick check is:-

Put a meter across the coil, does not matter which one or which way round, just go on the two terminals at the end of the ignition coil with the meter set to volts.

Turn the ignition on, you should see NO volts. If you do see volts then this means the wiring to the pickup is broken.

Now turn the engine slowly over, you will now see volts. If you do then the ignition is working.

If not then either you have no volts to the Boyer or the Boyer is dead.

The above only applies to the early analogue Boyers and not the new Micro-Digital. What do you have ?

Regards

Tony

Submitted by robin_pearson on Sat, 01/09/2012

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Hi Tony. Thanks for your guidance. The Boyer says 'MICRO MK III UNIT'. I will have more time to conduct your tests on Monday, as I'm working this weekend. Will keep you posted. Thanks again.

Robin.

Submitted by robin_pearson on Sun, 09/09/2012

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Previously wrote:

Hi Tony. Thanks for your guidance. The Boyer says 'MICRO MK III UNIT'. I will have more time to conduct your tests on Monday, as I'm working this weekend. Will keep you posted. Thanks again.

Robin.

Unfortunately the wiring situation is worse than previously thought, and I shall have to renew quite a few of the wires and their connectors before I can make any sensible tests. Thanks again for your input .

Robin.

 


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