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yanmar 4jh4-ae alternator

PostPosted: Wed Oct 09, 2013 8:16 am
by Sybar
I am considering switching from my balmar 120 amp alternator to an ample power alternator. The specific reason if to allow for alternator temp. sensing with the next step and emon II HI. Am I correct to assume that the 4023 IS is the correct alternator to use? I have a 3.15" mounting saddle on the balmar. The engine is a 2008 Yanmar 4jh4ae . I will also be converting to a serpentine belt pulley system. Thanks!!

Re: yanmar 4jh4-ae alternator

PostPosted: Wed Oct 09, 2013 11:12 am
by Coulomb
The 4023S is the correct alternator.

Just to be clear: Ample alternators do not need or use temperature limiting. The temperature sensors with the Next Step and EmonII are used to measure battery temperature.

Re: yanmar 4jh4-ae alternator

PostPosted: Thu Oct 10, 2013 10:14 am
by Sybar
The reason I want alternator temperature sensor capability is that I just fried my 100 amp Balmar. Belt and suspenders so to speak. So which alternator ( Ample) would I get? Thanks!!

Re: yanmar 4jh4-ae alternator

PostPosted: Thu Oct 10, 2013 11:47 am
by Coulomb
Alternator temperature sensing is required on alternators that don't use appropriate windings and diodes. Built-in regulators provide temperature protections on all automotive alternators. They do that by reducing output Amps to a level safe for the cheap materials the alternators are built with.

Slowing the charge rate is OK in an auto, but not the way to a "fast, full charge".

The 4023-S alternator is the one you want. It doesn't need to have temperature sensing to protect it from sustained high output current.