Crazy charging issue. I need help!

Discussion in 'Stock Performance/Mechanical' started by xrbeach13, Feb 1, 2020.

  1. xrbeach13

    xrbeach13 Member

    Joined:
    Oct 17, 2012
    Messages:
    73
    Likes Received:
    0
    So mid November I noticed a buzzing noise through my aftermarket stereo and noticed a slight drop in voltage at the same time. I found the alternator only putting out 30 amps max. So I ordered a high output alternator from power bastards. Installed it and amps jumped up around 50 with a bunch of loads on, the buzzing noise continued so I started messing around with speakers and amplifiers and found 2 tweeters blown and a sub which must have happened right after the buzzing started. So I replaced those with new and no fix. Swapped headunits no fix. I started testing all grounds in the truck with nothing found. I replaced the alternator main wire and ground wire with 0 gauge copper wire. Performed a component test on the ignition switch had slightly higher resistance so I replaced too with no fix. Started digging through alldata at work and found the body ecu control is attached to the alternator circuit so since I've been throwing parts at it anyway I decided to order that too lol so now with new alternator battery ignition switch power and ground wire new terminals new used body ecu and ignition noise isolator the problem continues. I ohmd out all of the alternator wires without finding anything except that the alternator wire that goes the the body ecu and cluster has 12 volt with almost no amperage to light up a test light. So I played with my truck non stop for almost 3 months after work with no luck and alot of cursing. Just as want to give on it the voltage gauge starts bouncing while I'm on the highway. Now the alternator is hardly putting any amps out and is erratic. So today at work I ripped everything aftermarket out stereo air compressor cutout just to aid in diagnosing but I'm about to give up I've talked to multiple toyota shop foreman that I used to work with with no new ideas. It's a really wacked out charging issue but if anyone has any ideas it would be greatly appreciated.
     
  2. NHXRUNNER

    NHXRUNNER "New Hampster"
    Staff Member

    Joined:
    Jul 30, 2007
    Messages:
    7,877
    Likes Received:
    259
    Damn rich that sucks. I wish I could help you but you’ve done everything I would have suggested. So you haven’t been able to pinpoint where the actual sound is coming from? Or is it the head unit but can’t make it stop?
     
  3. xrbeach13

    xrbeach13 Member

    Joined:
    Oct 17, 2012
    Messages:
    73
    Likes Received:
    0
    So the noise through the stereo is being caused by a charging issue I believe.But I replaced everything in the circuit except for the wires from engine fuse block to body control module( interior fuse block) and the cluster. Checked diodes and resistance in cluster but just with no specs to go by, at least one of the two diodes are good in the alternator circuit in the cluster. the suspect wire with a test light on it shows almost nothing. Very weak wire coming from both body ecu and cluster. Unplugging the body ecu and alternator the voltage remains but only goes away when unplugging the cluster. This is the only thing I found but no body has been able to tell me what kind of voltage or amperage should be on this circuit.
     
  4. mejbro

    mejbro Member

    Joined:
    Jul 11, 2016
    Messages:
    89
    Likes Received:
    25
    When you hear a buzzing you usually want to look for kilowatts. On industrial motors you can hear the frequency if the kW is over a specific limit. I dunno if that helps.
     
  5. mejbro

    mejbro Member

    Joined:
    Jul 11, 2016
    Messages:
    89
    Likes Received:
    25
    Also, are you running an Optima ( yellow top ) or similar? Sounds like you got quite the system.
     
  6. xrbeach13

    xrbeach13 Member

    Joined:
    Oct 17, 2012
    Messages:
    73
    Likes Received:
    0
    I've been planning on trying to test the fuel pump circuit for noise but the noise remains present with the relay removed until stalling. Also I have a dual battery set up with and isolator to a northstar SMS agm220 for the stereo because I'm running about 4000 rms to 18 speakers but noise wasn't present through the stereo with the stereo battery removed. Noise never happened while the the two batteries were connected in the first year of the stereo.
     
  7. mejbro

    mejbro Member

    Joined:
    Jul 11, 2016
    Messages:
    89
    Likes Received:
    25
    Everything listed would have a fuse to protect the circuit. Fuel pumps fail with higher mileage, power adders without upgrading fuel system etc. Sadly, when my Iroc Z Camaros fuel pump whined, I hit the top of the fuel cavity with a dead blow. ( What? I was 13 and removed the back seat )
    Maybe the alternator is an isolated incident that you've solved. I've had buzzing noises come from my stock exhaust, even the new exhaust from the hanger rubbing the cross brace under the tranny. Is it louder in the cab, outside the cab?
    I apologize for adding to your original questions. Wish you the best of luck
     
  8. NHXRUNNER

    NHXRUNNER "New Hampster"
    Staff Member

    Joined:
    Jul 30, 2007
    Messages:
    7,877
    Likes Received:
    259
    Also have you tried pulling the HU to see if the buzzing stops?
     
  9. Edgeman

    Edgeman Member

    Joined:
    May 17, 2008
    Messages:
    997
    Likes Received:
    8
    Guess try to do the simple stuff first. Have you had your battery tested by something that can put a load on it? If not, then head to your local Advance Auto or Auto Zone to have a free check. How did you test the alternator output? Heck, have them check that too.

    Once you know those are good, you can move to the next possible culprit...
     

Share This Page

  • About Us

    XR-Underground is a dedicated community of Toyota X-Runner enthusiasts that was launched in January 2007. X-Runner Underground.com, referred to as XRU by our regular members, offers an active discussion forum, group events, specialty merchandise, a welcoming community of owners and the most information you can find about the Toyota X-Runner on the internet!
  • Quick Navigation

    Open the Quick Navigation

  • Like us on Facebook

  • Your donations keep XRU going

    XRU is a forum for the users, by the users. We receive very limited funding from vendors so we really rely on donations to cover our operating costs and to provide products and giveaways at events. Every dollar helps!

    If you are able to donate, we'd really appreciate your help.