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Alternator Output Too High?


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#1 PaulR

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Posted 09 May 2018 - 06:09 PM

I recently posted ( 3 weeks ago) how the ballast resistor on my Lumenition ignition had failed & I replaced the coil with a Lucas gold one and did away with the resistor

All was fine until today, when she died. After a bit of diagnostics the lucas coil has failed  (It wasn't that old). I'm now thinking that I may have too high an output form the alternator that has burnt out the ballast resistor and now a perfectly good coil.

Any suggestions as to my next step please.


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#2 RogerH

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Posted 09 May 2018 - 06:17 PM

Hi Paul,

                when you say 'your alt out put'  are you referring to the voltage or the amps.

 

The amps should have not effect.

Why not stick another coil on and get it running and then measure the volts on the battery when running.

Should be somewhere about 13.7 - 14.2 ish.

 

You could also measure the volts on the + of the coil.

 

If the volts are to high then change the regulator pack on the back of the alt.

 

Roger


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#3 TR 2100

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Posted 09 May 2018 - 06:29 PM

New coils are not as bullet proof

as you might imagine.

 

AlanR


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#4 AndrewMAshton

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Posted 09 May 2018 - 07:09 PM

Hello Paul, if you have fried the alternator check your battery as well, mine was bulging!!, and fit a heat shield to stop it happening again, cheers, Andrew


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#5 stuart

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Posted 10 May 2018 - 09:06 AM

If it was a so called "Lucas Gold" item then they are known to be a bit short lived unlike the originals Im afraid. Talk to Martin Jay (Distributor doctor) and get one of his proven coils http://www.distributordoctor.com/

Stuart.


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#6 TR5tar

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Posted 10 May 2018 - 10:37 AM

If it was a so called "Lucas Gold" item then they are known to be a bit short lived unlike the originals Im afraid. Talk to Martin Jay (Distributor doctor) and get one of his proven coils http://www.distributordoctor.com/

Stuart.

 

+1


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#7 Graham Harris

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Posted 10 May 2018 - 11:50 AM

If you are going to run with out the ballast resistor you need a coil to match otherwise you will be pumping 12v into a 10v coil?

 

Graham


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#8 Dic Doretti

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Posted 11 May 2018 - 07:17 PM

If you have Lumenition electronic ignition use a Lumenition coil. Some electronic ignition suppliers (Powerspark) specifically state a sports coil should not be used. Lumenition should recommend the coil resistance.

          Cheers

                      Richard


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