Electrical Issues/voltage too high? help please.
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This is a discussion on Electrical Issues/voltage too high? help please. within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; So, 05 rex, just got new heads new gaskets valve cover seals etc through dealership it was bought from. Compression ...

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    Registered User Bblue Rrex's Avatar
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    Exclamation Electrical Issues/voltage too high? help please.

    So, 05 rex, just got new heads new gaskets valve cover seals etc through dealership it was bought from. Compression is 100% on all 4 no leaks everythings good now. Only issue is there not letting it go due to an electrical issue. They're saying its running great but feels like its lackin some power when hitting boost. When I had the car before it was gettin fixed it had a rough start up, almost studdered kinda, took longer than my old bugeye then it would start. Also when I plugged in the AP to run stage 1 it shot me a warning saying the "voltage was too high " at I believe something close to 13.0456 volts.

    I talked to a friend who's a tech for toyota and has built a few cars and he said 9/10 times its the restrictor? In the alternator going causing it to overcharge and its not being regulated correctly. And he said the best bet is to replace the alternator and go from there. Is this true?

    I would appreciate any input, I want my car back, its been almost 3 months of problems and its so close to being home.

    Thanks guys!
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    He simply abides. SD_GR's Avatar
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    Quote Originally Posted by Bblue Rrex View Post
    I talked to a friend who's a tech for toyota and has built a few cars and he said 9/10 times its the restrictor? In the alternator going causing it to overcharge and its not being regulated correctly. And he said the best bet is to replace the alternator and go from there. Is this true?
    No. There is no restrictor. What your friend may have been thinking is the voltage regulator. That is in fact housed in the alternator, so replacing one does replace the other. The voltage measured by your AP is not abnormal though I don't think.
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    Registered User poly_poly-man's Avatar
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    check your grounds. A bad ground will make starting weird and will also make a floating point which gives weird voltage comparisons.
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    Registered User Bblue Rrex's Avatar
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    Sorry, regulator is what he said, I messed that up lol. Alright. Then why is the AP shootin a warning for the voltage being too high? I though off the volts should be around 12.5. Not 13+.

    Also, could it possibly be the battery? And I though of grounds too. Ill mention that to the dumb**** dealership too
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    while running above idle you should see 13.8 +/- at the alternator.. given voltage drop across the system you should see at least mid- high 12's at the fuse block. Have you pulled the alternator and had it tested? Any autoparts store should be able to do that for you. A bad battery might cause LOW voltage issues but not high.. this is DEFINITELY a regulator problem if you actually have a problem.

    Before you pay for any diagnosis.. yank the alternator and have it tested.
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    Quote Originally Posted by mangostick View Post
    while running above idle you should see 13.8 +/- at the alternator.. given voltage drop across the system you should see at least mid- high 12's at the fuse block. Have you pulled the alternator and had it tested? Any autoparts store should be able to do that for you. A bad battery might cause LOW voltage issues but not high.. this is DEFINITELY a regulator problem if you actually have a problem.

    Before you pay for any diagnosis.. yank the alternator and have it tested.
    Idk if I stated it, but I'm not the one doing the work, or paying for it. Its this dealership in PA..basicly a bunch of shady scamartists that I made the mistake of giving my business...the techs are halfa** twits that don't know too much. So ill definitely tell them this. I told them I just want the alternator and regulator replaced
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    Registered User 2.0Rs's Avatar
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    Quote Originally Posted by Bblue Rrex View Post
    Idk if I stated it, but I'm not the one doing the work, or paying for it. Its this dealership in PA..basicly a bunch of shady scamartists that I made the mistake of giving my business...the techs are halfa** twits that don't know too much. So ill definitely tell them this. I told them I just want the alternator and regulator replaced
    Which dealer?

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    Registered User Bblue Rrex's Avatar
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    AutoExchangeUSA in lancaster pa, off harrisburg pike....wish I NEVER would have given them my business, but we all make mistakes and its slowly gettin better.
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    Moderator Donkey's Avatar
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    Excessive voltage would be above 15volts. 13.0 volts with the car at idle and no load is low..........
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    Registered User Bblue Rrex's Avatar
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    Quote Originally Posted by Donkey View Post
    Excessive voltage would be above 15volts. 13.0 volts with the car at idle and no load is low..........
    I said when I flashed the ecu it shot a warning saying 13.whatever volts. The car wasn't idling. The car was off with no power to any accessories .
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    Registered User Jusino's Avatar
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    what brand battery are you have in under the hood?. i have a stock subaru (Panasonic) battery, and have a capacitor with a volt read out with my amp, when i put the key in the ignition before starting it sits at 12.4v. w/ engine running at idle it sits around 14.2v, without any music pumping through. the battery is almost 4 years old.
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    Like I said.the cars bein worked on by the dealership..uh..."tech" I honestly don't know the kind of battery. But if yours is at 12..4 volts with the car off...then 13.04 is high. Does that mean the regulator is shot and needs to be replaced? Because like I said the little I had the car when you would turn the key it would sound as if its struggling to start up.....pretty much tryna aid the nit wits working on my car so I can have it back faster.
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    The Fruit mangostick's Avatar
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    what? wait.. so you have 13v without the car running.. but it struggles to start? ....... something doesn't add up here. Any stereo system in the car? What electrical accessories if any do you have installed?
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    Moderator Donkey's Avatar
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    Quote Originally Posted by Bblue Rrex View Post
    I said when I flashed the ecu it shot a warning saying 13.whatever volts. The car wasn't idling. The car was off with no power to any accessories .
    Take battery voltage with car off at the battery. Now start car and take voltage again when the car is fully warmed up. If the voltage is over 15v warm then the alternators voltage regulator is shot and is overcharging the battery. Have the battery load tested as well. Also for some reason bugeyes have an issue with this code popping up with flashing the ECU whether it's the AP or Opensource. The easy way around it is to turn on your lights or some accessories to bring the voltage down.
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