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8dja

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Reply with quote  #1 
Hi,
Noticed yesterday that my voltage dial was showing 16v which is the max it goes to.

Connected a multimeter to the batter and rev’d the engine and it was going as high as 18volts.

Would this indicate a faulty alternator or could it be something else?

Thanks
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TOC_Admin

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Reply with quote  #2 
It sounds very much like the alternator regulator has gone.

If this is a standard LRA100/LRA101 then you can get just the regulator from eBay for around a tenner - search for "17ACR regulator"

I would however recommend a service kit along the lines of the following which is only a little bit more:

https://www.ebay.co.uk/itm/LUCAS-ALTERNATOR-ACR-REPAIR-KIT-15-16-17-18-LRA100-RECTIFIER-REGULATOR-BRUSHES/313076492008
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martinq357

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Reply with quote  #3 
Yup, sounds like the alternator regulator is toast. As above, either new regulator assembly/rebuild or replace completely.
I'd stop running the car too, the battery won't take too much more of that kind of treatment.

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8dja

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Reply with quote  #4 
Thanks for your comments.
not sure what type it is, The only numbers on it I can see is DMA3606
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TOC_Admin

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Reply with quote  #5 
This looks like it's an OEM version of the original Ford Sierra / Escort alternator - it goes by many part numbers including XIA1222 or LRA653.  Unfortunately, I can't find a direct replacement regulator, though eBay has several if you search for "Alternator Regulator Sierra".  However, you could try several different ones until you find an approprate item.

Therefore, it may be worth considering replacing the alternator either with a Lucas LRA100/101 equivalent or a smaller Denso one.  The Lucas should be pretty much a straight swap, the Denso needs wiring changes - search the forum for "Denso" as this is not something I've done so I'll leave it to others to chime in who have done this job.

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