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  1. #106
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    Re: Why is my voltage drop so awful?

    I'm going to cut and restrip my power and ground to the amp, along with replace the fuse in the distro. If that doesn't fix it, I'm putting the other alt in. If that doesn't fix it, I'm selling everything, lol.








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    Re: Why is my voltage drop so awful?

    Quote Originally Posted by Still View Post
    Didn't help at all.

    When idling and nothing playing, the front battery was reading different than the rear battery and the amp, which were reading the same. When playing full tilt the amp was dropping to 11.5 (it's hotter today, than before) and the rear battery was dropping to 12.7. There's still a difference between the two, although there shouldn't be.
    I think it's time for some pictures of the wiring and connections. There is high resistance or this would not be happening. In a parallel circuit the voltages will be the same unless there is some resistance in series (in a run of wire). I am curious. If you unhook your amp, do the batteries read the same voltage then? If so, then connect the amp again but unhook the remote lead. Now are the batteries the same? If they are still the same, you need to have someone with a DC clamp meter, see what your amp is drawing with no music. If it's drawing greater than an amp or two when not playing anything it needs to be repaired.




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    Re: Why is my voltage drop so awful?

    Quote Originally Posted by eCrack View Post
    I think it's time for some pictures of the wiring and connections. There is high resistance or this would not be happening. In a parallel circuit the voltages will be the same unless there is some resistance in series (in a run of wire). I am curious. If you unhook your amp, do the batteries read the same voltage then? If so, then connect the amp again but unhook the remote lead. Now are the batteries the same? If they are still the same, you need to have someone with a DC clamp meter, see what your amp is drawing with no music. If it's drawing greater than an amp or two when not playing anything it needs to be repaired.
    Do you mean with the car running or off? Running I assume? Unfortunately, I don't know anyone with a clamp meter, so let's go through the first couple of steps first...





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    Re: Why is my voltage drop so awful?

    with no music truck running what voltage to you get at front and back battery.




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  7. #110
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    Re: Why is my voltage drop so awful?

    Quote Originally Posted by Still View Post
    Do you mean with the car running or off? Running I assume? Unfortunately, I don't know anyone with a clamp meter, so let's go through the first couple of steps first...
    car running, yes. i think you can do what he's saying by pulling the remote and checking. if the same numbers, then re-connect the remote. if that doesnt make a difference, then get the amp checked. testing for a bad amp...



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    Re: Why is my voltage drop so awful?

    Quote Originally Posted by jco1385 View Post
    car running, yes. i think you can do what he's saying by pulling the remote and checking. if the same numbers, then re-connect the remote. if that doesnt make a difference, then get the amp checked. testing for a bad amp...
    Exactly. We are going to get this thing solved. We just have to narrow it down first.




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  11. #112
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    Re: Why is my voltage drop so awful?

    Okay guys:

    Testing with car on, HU on, HU volume at 0, remote hooked up:
    Front battery: 13.68-13.69
    Rear battery: 13.64-13.65

    Testing with car on, HU on, HU volume at 0, remote NOT hooked up:
    Front battery: 13.68-13.69
    Rear battery: 13.67-13.68

    Resistance in the wire connecting the two batteries? I can check my solder joints, since I may have done a bad job on them...





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    Re: Why is my voltage drop so awful?

    Quote Originally Posted by Still View Post
    Okay guys:

    Testing with car on, HU on, HU volume at 0, remote hooked up:
    Front battery: 13.68-13.69
    Rear battery: 13.64-13.65

    Testing with car on, HU on, HU volume at 0, remote NOT hooked up:
    Front battery: 13.68-13.69
    Rear battery: 13.67-13.68

    Resistance in the wire connecting the two batteries? I can check my solder joints, since I may have done a bad job on them...
    that resistance might be the length of the wire. it's not much. the resistance you're worried about is between the amp and the rear battery. or maybe internally in the amp. how big is your alt? that should be closer to 14.4v w/ the car running.



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  14. #114
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    Re: Why is my voltage drop so awful?

    It's only an 18' run.

    Alt is an aftermarket 136A, but it's a factory replacement, not a true aftermarket designed for car audio. My true OEM alt used to charge at 14.4 during the winter, and as it warmed up it dropped to 13.9. Since then it's dropped further, although it's only gotten cooler out.





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    Re: Why is my voltage drop so awful?

    hmmmmmmmmmmmmm....... do that same test as up there ^^^ but also measure at the amp. a .01v drop over 18' isn't a worry. i'm curious what the voltage is at the amp with the amp on, volume down VS amp off (remote unhooked). should be very similar and should be the same as the battery shows. might need to find a clamp, or maybe swap a different amp in to try?



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    MTX 404 runs the inside
    MTX 1501d runs the X
    Optima G75/25 RT up front
    2x Optima G31 YT in the trunk
    200a EA HO Alt (1/0 Big 3)
    ALL MY WIRE IS WELDING CABLE
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    Quote Originally Posted by Rashaddd View Post
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    Quote Originally Posted by ToledoTom View Post
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    DO NOT SEND ME ANYTHING USING UPS. I WILL NOT DEAL WITH THEM EVER AGAIN
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    Re: Why is my voltage drop so awful?

    I don't have another amp that draws this much current, nor can I find a clamp meter. :/ I'll try that.





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    Re: Why is my voltage drop so awful?

    Quote Originally Posted by Still View Post
    Okay guys:

    Testing with car on, HU on, HU volume at 0, remote hooked up:
    Front battery: 13.68-13.69
    Rear battery: 13.64-13.65

    Testing with car on, HU on, HU volume at 0, remote NOT hooked up:
    Front battery: 13.68-13.69
    Rear battery: 13.67-13.68

    Resistance in the wire connecting the two batteries? I can check my solder joints, since I may have done a bad job on them...
    This shows the amp is good, the wire has high resistance somewhere. This happened to one of my dad's hi performance CB installs. He was a die hard solderer until we had this same problem. We replaced it all with crimp ons and it fixed it. That SHOULDN'T happen, but sometimes it does.




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    Re: Why is my voltage drop so awful?

    Quote Originally Posted by jco1385 View Post
    hmmmmmmmmmmmmm....... do that same test as up there ^^^ but also measure at the amp. a .01v drop over 18' isn't a worry. i'm curious what the voltage is at the amp with the amp on, volume down VS amp off (remote unhooked). should be very similar and should be the same as the battery shows. might need to find a clamp, or maybe swap a different amp in to try?
    Testing with car on, HU on, HU volume at 0, remote hooked up:
    Front battery: 13.75
    Rear battery: 13.72
    Amp: 13.68

    Testing with car on, HU on, HU volume at 0, remote NOT hooked up:
    Front battery: 13.75
    Rear battery: 13.74
    Amp: 13.74





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    Re: Why is my voltage drop so awful?

    Quote Originally Posted by eCrack View Post
    This shows the amp is good, the wire has high resistance somewhere. This happened to one of my dad's hi performance CB installs. He was a die hard solderer until we had this same problem. We replaced it all with crimp ons and it fixed it. That SHOULDN'T happen, but sometimes it does.
    Honestly, I didn't know the first thing about soldering, I just started doing it on all my lugs one day. I didn't know what a cold solder joint was or what causes it until you mentioned it in this thread. After having learned a thing or two I'm sure that my technique has improved, and I should resolder these terminals.

    Can old solder or lugs that have been reused multiple times cause this?





  20. #120
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    Re: Why is my voltage drop so awful?

    Quote Originally Posted by Still View Post
    Honestly, I didn't know the first thing about soldering, I just started doing it on all my lugs one day. I didn't know what a cold solder joint was or what causes it until you mentioned it in this thread. After having learned a thing or two I'm sure that my technique has improved, and I should resolder these terminals.

    Can old solder or lugs that have been reused multiple times cause this?
    Lord have mercy, I'm gonna have to read this whole thing. I cant believe nobody's got this straight yet.


    Soldering is overrated. No is the answer to your question.



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