Alternator upgrade from 55 Amp to 85 amp

Technical Discussion on Pre-1973 Mustangs

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booah
Junior Mustang
Junior Mustang
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Joined: Sun Aug 15, 2010 7:01 pm

Alternator upgrade from 55 Amp to 85 amp

Post by booah »

Hi all
getting a nit of mixture of part numbers etc trying to upgrade the 55 amp bosch to an 85 amp.

The old one is a Motorcraft/ Bosch 9 120 060 492 55amp

Looks like the new 85 amp is Bosch number BXF-1238A.

Can anyone confirm or offer alternatives?

The car has had twin thermos added, battery moved to the boot with upgraded cables etc that go along with the move.

Was driving back in the ran the other day with the heater on, wipers on, stereo on, headlights on, crawling thru traffic in rush hour and when the fans cut in the battery voltage would drop to just over 12V.

I know the cause.....shouldn't have been driving in the rain!
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