IRP 140 Amp Alternator


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The stock FD alternator is rated at 90 amps, which is adequate for stock cars. Our 140 amp upgrade significantly improves the charging system’s capacity. If you are running aftermarket gauges, stereo, larger fuel pumps, auxiliary lighting, mini battery, etc this is a very worthwhile upgrade. Each alternator starts with a full cleaning and media blasting of the case. The alternator then undergoes a full rebuild. A larger stator with more windings and matching regulator is fitted to increase the amperage. Don’t be fooled by others claiming a higher output. Those units have to be spun much faster to generate the claimed amperage and will cause charging issues at idle. We have tried and tested these units and have found the best balance of output vs rpm.

-Please note that we require your core alternator to perform the rebuild and upgrade. Due to the increased cost of alternator cores, we had to increase the core fee. There is an $125 core fee if you are not supplying us with your alternator first, which is refundable upon receiving a good core.

– An alternator with a cracked case is not acceptable as a core. The most common way this happens is trying to hold the alternator stationary by inserting a screwdriver or other tool through the vanes of the case while removing the pulley nut. The pulley nut must be removed with an impact wrench.

-There will be a $25 fee charged to replace a broken alternator post. The most common way this breaks is improper padding during shipping. You may remove the post and send it with the alternator if you wish.


Please contact us for more details.

Additional information

Weight 20 oz
Dimensions 10 × 8 × 5 in

I'll send my core to be built., I do not have a core to send.


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