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Old 01-13-2012, 07:51 PM
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Default HO Alt/voltage question

So i am waiting on my Excessive Amperage 250a alt to come in and i had to get the external regulator, but here is my question....What is the maximum voltage i can set it to without frying the pcm/ecu? My 97 Jeep Grand Cherokee limited V8 has the pcm control the voltage so when i get the new alt it will be externally regulated instead. I know some cars can be at like 14.8 and some at like 15.5, but what can i set mine to?
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Old 01-14-2012, 08:48 AM
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i have been thinking of sending my alt back to nate and going external as well. my computer only lets me see 14.5 max when cold and 14.2 warm. i wanna set it at 14.7 and keep it there. let me know how your turns out so i can decide what i am going to do.
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Old 01-14-2012, 08:56 AM
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Alright, will do. I'm just worried about frying my ecu/pcm cuz it can only handle so much voltage.

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Originally Posted by BallzFast View Post
i have been thinking of sending my alt back to nate and going external as well. my computer only lets me see 14.5 max when cold and 14.2 warm. i wanna set it at 14.7 and keep it there. let me know how your turns out so i can decide what i am going to do.
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Old 01-14-2012, 11:29 AM
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Quote:
Originally Posted by law112493 View Post
So i am waiting on my Excessive Amperage 250a alt to come in and i had to get the external regulator, but here is my question....What is the maximum voltage i can set it to without frying the pcm/ecu? My 97 Jeep Grand Cherokee limited V8 has the pcm control the voltage so when i get the new alt it will be externally regulated instead. I know some cars can be at like 14.8 and some at like 15.5, but what can i set mine to?
Thanks

jeep had/has in mind with there electrical that most people will likely install wenches and other high demand items. as it was told to me, the eec is 16vdc safe. not to exceed 16vdc. 15.5vdc can be dangerous. if it spikes beyond 16vdc after time it will cause the eec to fail. thats why most systems are set to about 13.5-14vdc. pretty much everything else will run ok to but again keep in mind that more voltage to your lights, fans ext will also cause them to run warmer resulting in decreased life of your components. thats why most people with the higher voltage systems will use step downs to run the systems while allowing the higher voltage to run the audio system.

there are alot of threads all over this forum on voltage in the search engine. i know it can be boring but check some out before you decide to do anything.
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Old 01-14-2012, 11:34 AM
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Alright, thank you. I just wasn't sure, i will probably set mine at about 14.3 or so but i just wanted to see if it would be bad to go any higher. Sounds a little dangerous to me to go higher. But thanks and i will definitely search for some.

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Originally Posted by slowpoke View Post
jeep had/has in mind with there electrical that most people will likely install wenches and other high demand items. as it was told to me, the eec is 16vdc safe. not to exceed 16vdc. 15.5vdc can be dangerous. if it spikes beyond 16vdc after time it will cause the eec to fail. thats why most systems are set to about 13.5-14vdc. pretty much everything else will run ok to but again keep in mind that more voltage to your lights, fans ext will also cause them to run warmer resulting in decreased life of your components. thats why most people with the higher voltage systems will use step downs to run the systems while allowing the higher voltage to run the audio system.

there are alot of threads all over this forum on voltage in the search engine. i know it can be boring but check some out before you decide to do anything.
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