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Reload Thread: HO Alt with or without external regulator.. Need some advice

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    HO Alt with or without external regulator.. Need some advice

    Hello all, I have a NBS chevy silverado with a 5.3l motor. The NBS trucks have a regulator that cuts the voltage down from 14.4 to 12.5 or so to help save gas. I am going to install my 300a HO alt this weekend and I am not sure if I should use the external regulator I bought with the alt or not.

    Seems pointless to have the HO alt if my PCM is just going to cut its output to save gas when I am trying to keep a steady 14.4 voltage to run my setup.

    Does anyone have any experience with this technology from GM that cuts the alts output to help save gas?



    Ride:2009 Silverado Crew Cab
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    Re: HO Alt with or without external regulator.. Need some advice

    Dont have the experience with the system, but if this is true, you want a higher voltage to keep things running cool. With this said if you don't use the regulator, you need something in place (battery or cap) to absorb the spikes & dips in the power output of the alternator so you do not exceed the power rating of the equipment.




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    Re: HO Alt with or without external regulator.. Need some advice

    well it doesn't spike it just dips for long periods. It starts at 14.4+ then sometimes drops to 12.5 or so



    Ride:2009 Silverado Crew Cab
    H/U: Pioneer avh-p4400bh
    Amps: Ampere Audio 3800.1 Ampere Audio 125.4
    Subs: 2 Tantric HDD 15's
    Enclosure: 4th Order Blow Through
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    Singer 320 Hairpin 6 phase

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    Re: HO Alt with or without external regulator.. Need some advice

    Rvc has a sensor around the Neg cable. If you are cranking on the system it will see that and boost the voltage. You will see better performance with the ext. regulator but it may set a service light.



    95 Sonoma Ext Cab 4.3L 5spd, Dual alts Tenney 270 amp alternator and 240 amp H.O.alts, 4 DEKA AGM batteries
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    Re: HO Alt with or without external regulator.. Need some advice

    Quote Originally Posted by truckramrod View Post
    Rvc has a sensor around the Neg cable. If you are cranking on the system it will see that and boost the voltage. You will see better performance with the ext. regulator but it may set a service light.
    Thanks man. I am going to run the alt without the ext reg first and see what the numbers are. If I am dropping to much I will throw in the ext reg



    Ride:2009 Silverado Crew Cab
    H/U: Pioneer avh-p4400bh
    Amps: Ampere Audio 3800.1 Ampere Audio 125.4
    Subs: 2 Tantric HDD 15's
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    Mids/Highs: Tantric HD
    Singer 320 Hairpin 6 phase

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    Re: HO Alt with or without external regulator.. Need some advice

    You can test performance of it with the tow/ haul mode engaged or the headlamp switch on. That can allow the system to boost voltage. I have customers occasionally ask why their systems aren't charging.



    95 Sonoma Ext Cab 4.3L 5spd, Dual alts Tenney 270 amp alternator and 240 amp H.O.alts, 4 DEKA AGM batteries
    Pioneer deh8400 rsd250.2 powering Infinity Kappa60.5 comps and Morel coaxials
    7.2 cube net wall 2 crossfire XSv215s and 4 bb2400.1s.
    Daily Driver: 1995 Buick Park Avenue "leather couch on wheels"
    JVC KD-HDR60 Aura RPM2300 on Opti5.1 comps and Planet Audio zr300.4 bridged on Morel Ultimo 6X9's
    REFS: AMPJUNKIELIKEME, SERJR711, ZEUSILICIOUS

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    Re: HO Alt with or without external regulator.. Need some advice

    mechman has a external regulator that lets you set your charging rate so u can set it too 14.5-15.8 i believe check out their website see if they have one for your application



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    Re: HO Alt with or without external regulator.. Need some advice

    GEtting a external reg is not the issue, that is easy. Just wondering if i will need it



    Ride:2009 Silverado Crew Cab
    H/U: Pioneer avh-p4400bh
    Amps: Ampere Audio 3800.1 Ampere Audio 125.4
    Subs: 2 Tantric HDD 15's
    Enclosure: 4th Order Blow Through
    Mids/Highs: Tantric HD
    Singer 320 Hairpin 6 phase

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    Re: HO Alt with or without external regulator.. Need some advice

    If this was my vehicle, I would get an external no doubt.



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