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Voltage issue


This is a discussion on Voltage issue within the General Discussion forums, part of the Viper Truck SRT-10 Discussion category!
Originally Posted by ViperPete The belt is pretty new. I doubt its the belt as the alternator performs perfect above ...



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Old 01-16-2018, 10:51 PM
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Quote:
Originally Posted by ViperPete View Post
The belt is pretty new. I doubt its the belt as the alternator performs perfect above 1k RPM




Not sure of the brand i think its Autozone brand. But it is at least 5 years old.
I'm gonna throw a new battery in it and see what happens before I look into an alternator.
A new battery is cheaper than a alternator plus given the age of your battery its likely time to replace it anyway. Battery might not be able to hold a charge as well, putting a strain on the alternator.

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Old 01-17-2018, 08:53 PM
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I donít post very often but thought I would chime in here as Iím experiencing similar symptoms. I installed an Optima Red Top battery a couple years ago and started experiencing very ďsluggishĒ startups this past summer so I took it back to Auto Zone to get the battery tested and it checked ok. After discussing some of the same symptoms you mentioned, he did the load test Tony suggested and said the alternator was doing itís job as well but said the truck was not producing the voltage it was supposed to be producing. After some digging it didnít take long to learn, as Iím sure most already know, the voltage regulation is controlled by the computer. Hopefully yours is simply the alternator as thereís not many options out there for us. Iíve been researching a little and when mine completely lays down I may try to splice in an old school external voltage regulator instead of replacing the ECU. Anyways, good luck with finding your solution!
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Old 01-19-2018, 09:03 AM
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Got a new battery. The engine starts instantly now, but there is no difference when sitting at a stop light with the headlights and heat/stereo on. Voltage still drops to 12 and then rises to 14v when I raise the RPM.

Guess I need a new alternator that has more voltage at idle.
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Old 01-20-2018, 06:57 PM
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Are you running underdrive pulleys by any chance? If so, is the alternator just not turning fast enough at idle? Just a thought...
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Old 01-20-2018, 07:49 PM
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Originally Posted by sleepersrt10 View Post
Are you running underdrive pulleys by any chance? If so, is the alternator just not turning fast enough at idle? Just a thought...
Yes i have an under drive pulley. I priced out a new stock pulley/tensioner/belt and its only a little more and i can get a 210 amp alternator. Might just go that route. My alt is 13 years old.
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2016 Nissan Maxima SR
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Old 01-21-2018, 11:43 PM
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Originally Posted by ViperPete View Post
Yes i have an under drive pulley. I priced out a new stock pulley/tensioner/belt and its only a little more and i can get a 210 amp alternator. Might just go that route. My alt is 13 years old.
Didn't know you had a under drive pulley, that with what is likely an original alternator is likely your problem

I was going to ask about the last time you changed your serpentine belt. I just changed mine with a new one, and noticed the old one had looked like it stretched itself an extra inch.

Putting belts on these trucks are PITA as well.
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Old 02-04-2018, 01:07 AM
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Please, someone, explain to me "underdrive pully".

Al
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Old 02-04-2018, 08:43 AM
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It will charge slightly less sitting still at idle, but in the years I had it on my truck and over a 150k miles, never caused an issue one. 12.5 at idle is perfectly fine. Will not cause slow starting! That's the battery. Many don't give it sufficient cranking Amps when buying new. 850-1000 I like to see.

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Old 02-04-2018, 01:29 PM
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Originally Posted by aldrinledwidge View Post
Please, someone, explain to me "underdrive pully".

Al
Its a crankshaft pulley that is smaller than stock and adds a few ponies buy freeing up some of the loss caused by the accessories
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