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Old 12-06-2017, 12:56 PM
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Default New alternator but voltage is behaving the same. Can't figure it out

So I just upgraded from a stock 100amp alternator to a mechman 240amp. But my voltage is doing the same thing via my cheap cigarette lighter voltage meter. Starts out at 14.1 when I turn the car on and slowly goes down to about 13 over the course of an hour. This is exactly what it was doing before. Do I need to upgrade my battery? I'm using a sundown SAE1000d and a nvx jad800.4 but the voltage behaves the same no matter if I am playing music or have the system on standby.
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Old 12-07-2017, 01:47 PM
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Many cars will regulate the voltage to be as low as possible to preserve fuel economy. This is a function of the regulator native to the vehicle. Under load the regulator should increase the voltage to accommodate, so turning on your headlights and/or HVAC might bump it up a bit. Depending on if your vehicle senses current or just potential, turning up the system may or may not trigger the regulator to increase voltage.

It should be possible to have a self-contained regulation circuit if you absolutely must have ~14.4 regardless of the electrical load. I do this in my car with an external adjustable Transpo regulator. Your alternator might have to be modified to work with an external regulator. Note that depending on the car you will have to disconnect the stock regulation circuit, and this might trigger a fault with the car's ECM/ECU.

Unless you are having a problem with the voltage dipping below ~12v during dynamic musical peaks, it might not be necessarily to do anything. Plenty of cars do the same thing yours does.
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Old 12-07-2017, 04:36 PM
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first of all what kind of vehicle, that can explain a lot. secondly, never trust those plug in cigarette lighter volt meters, they are wired through the computer and arent directly to your battery but to what the cars electronics are seeing. you need a volt meter ran directly to your amp, or your battery.
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Old 12-07-2017, 09:43 PM
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It's a scion tc 2015. I suspected something like this. I'll try turning off eco mode or running in sport to see if the voltage changes. And yeah i should get a real volt meter maybe on a line driver.
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Old 12-29-2017, 11:12 AM
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The first car I ever bought new was a 2004 Scion Tc. Very reliable, nice car, especially for the money. It drove and handled so good. Had a Memphis HPO 12" in a VT box, or pro box, or whatever they were called at that time, with a Memphis 500X1 amp and a really nice Panasonic head unit. That thing absolutely DRILLED in that car. That was back when Memphis was THE up and coming car audio brand and the hottest thing around. Then a few yrs later the recession hit and well, it seems they never recovered. Anyway, didn't mean to derail the topic.
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Old 12-29-2017, 11:26 AM
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Steve Meade just did a video about this voltage issue with Lexus & Toyota. https://youtu.be/wAi50Xo5dKY
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Old 12-29-2017, 05:30 PM
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I just saw that video too. I'm emailing singer to see if they have the right connector for my scion tc. It should be the typical 4 pin toyota so maybe they do. Getting a d3400 to replace the stock wet cell up front too. The battery seems to drop voltage at a normal rate though so I think I just need the voltage booster.
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