wierd battery problem

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • MikeE30325i
    Banned
    • Aug 2006
    • 2356
    #1

    wierd battery problem

    ok this is a little complicated, so i will try to sum it up as easily as i can.

    here is the problem.

    when i start my car in the morning or whenever it starts fine, but the battery light is on full blast. then if i kick the rpm's above 1500, the light shuts off and goes very dim. if my sub is on at this time it makes a loud whining noise, rpm dependant. it seems as if my voice coil is matching the frequency of my engine. i dont know if this has anything to do with it, i just wanted to throw it out there.

    now as i drive the light gets brighter as the rpm's climb. then when i shift the light gets dimmer. it never fully goes out, but it is the most dim when the car is just idling after it is warm.

    i dont have any battery drain problems, so that isnt a factor, but do any of you guys have any ideas? is it a bad ground to the alternator?
    Tags: None
    • ivo316
      E30 Fanatic
      • Oct 2006
      • 1222
      #2
      Could be a shot belt, my light never came off until i got a new one.

        Comment

        • MikeE30325i
          Banned
          • Aug 2006
          • 2356
          #3
          Originally posted by ivo316
          Could be a shot belt, my light never came off until i got a new one.
          I just replaced the belt. would an incorrect tension on the belt cause this? i dont think i hercules'ed the thing tight.

            Comment

            • AdamF 88iS
              R3VLimited
              • Oct 2003
              • 2051
              #4
              If it was very loose you could get this.

              The alternator may simply be going bad as well. Check for good ground connections off of the engine and at the battery too.
              Adam Fogg- '88 M3

              Common sense- It's the new 'gifted'

                Comment

                • HST
                  Mod Crazy
                  • Jan 2006
                  • 757
                  #5
                  The whining sound under load, the sub, leads me to think alternator.
                  Originally posted by KingB
                  Scratch my back and I buy a prostitute for you, to rub your balls. HAHA now thats some funny shit.

                    Comment

                    • MikeE30325i
                      Banned
                      • Aug 2006
                      • 2356
                      #6
                      ok, autozone has a thing where it can check your alternator. and if it is bad i will just replace it after i do the swap.

                      it doesnt drain the battery, so i dont think it is that much of a dire need. but thanks for all the info guys.

                        Comment

                        • jhower08
                          E30 Addict
                          • Jan 2005
                          • 494
                          #7
                          mine has been doing the same thing, ever figure this out?

                            Comment

                            • jlevie
                              R3V OG
                              • Nov 2006
                              • 13530
                              #8
                              That's going to be a bad alternator, or more electrical load than the alternator can supply (like from a ridiculous sound system). In rare cases it may be the alternator drive belt, but that is almost always accompanied by screeching noises from the engine bay.
                              The car makes it possible, but the driver makes it happen.
                              Jim Levie, Huntsville, AL

                                Comment

                                • jhower08
                                  E30 Addict
                                  • Jan 2005
                                  • 494
                                  #9
                                  all i have done to my sound system is a headunit. and my belts are quiet.

                                    Comment

                                    Previous template Next
                                    Working...