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Thread: intermittant wiper and no cruise control???

  1. #1
    Join Date
    Aug 2005
    Location
    east anglia uk
    Posts
    266

    Default intermittant wiper and no cruise control???

    ive got a strange one here, when i turn my stereo on i lose my cruise control and my slow wipers got to intermittent. turn the stereo off and its all back to normal! is there a possibility the stereo is drawing too much power making me lose these or can it be something ive overlooked? ideas would be great! daemon

  2. #2
    Join Date
    Mar 2006
    Location
    Great Britain
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    446

    Default

    Weird. Is your stereo just a unit in the dash or do you have an amplifier and/or sub too? Has the stereo previously worked properly without casuing this problem or was the stero recently installed?

  3. #3
    Join Date
    Aug 2005
    Location
    east anglia uk
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    Default

    Quote Originally Posted by pingu
    Weird. Is your stereo just a unit in the dash or do you have an amplifier and/or sub too? Has the stereo previously worked properly without casuing this problem or was the stero recently installed?
    heres whats fitted
    2 x jbl 12" subs
    2 x 4way 6x9s
    4 x tweeters
    upgraded footwell+rearshelf speakers (still pioneer)
    1 x kenwood 1500 watt amp (jbl's)
    2 x kenwood 200 watt amps (footwells)
    1 x kenwood 100 watt amp (tweeters)
    1 x splx 800 watt amp (running 6x9's)
    kenwood kdc7031 cd head unit
    the problems been there for a while but only realised the link the other day when i forgot my stereo front so had my stereo off for the first time since fitting it, cant remember if its only been there since fitting stereo or before?
    Last edited by bullyd; 05-23-2006 at 07:58 AM. Reason: typo

  4. #4
    Join Date
    Dec 2003
    Posts
    868

    Default Who installed it?

    sounds like someone cocked up the install

    Quote Originally Posted by bullyd
    heres whats fitted
    2 x jbl 12" subs
    2 x 4way 6x9s
    4 x tweeters
    upgraded footwell+rearshelf speakers (still pioneer)
    1 x kenwood 1500 watt amp (jbl's)
    2 x kenwood 200 watt amps (footwells)
    1 x kenwood 100 watt amp (tweeters)
    1 x splx 800 watt amp (running 6x9's)
    kenwood kdc7031 cd head unit
    the problems been there for a while but only realised the link the other day when i forgot my stereo front so had my stereo off for the first time since fitting it, cant remember if its only been there since fitting stereo or before?

  5. #5
    Join Date
    Nov 2004
    Location
    Middle England
    Posts
    286

    Default

    Your problem sounds (no pun intended) like it is either a weak power supply cable or a bad common-earth problem.
    I suspect the power supply from your description, but could be the earthing as well.
    Either way its a bad install - if you paid for this work then get them to fix it for free.

    First the supply possibility :-
    At which point did you tap into the power for your (very high powered !) audio units ? ... was it shared with the other equipment ?
    If so, I suspect that when you switch on, it causes a large volt drop in the supply cable, due the high current draw.
    (also means your maximum power/volume achievable is reduced)
    This low voltage then causes the cruise control to malfunction and the wiper speed/interval is probably voltage level sensitive too.
    You need to run a new supply cable (as thick as you can buy, because 2.8kW at 12 volts is over 200 amps ! - roughly the similar to your starter motor) to each unit from as physically near to the battery terminal as possible.
    Difficult to use a fuse here (but good audio units should have their own protection installed internally) or a switch/relay at this current level.

    Hmmm .. you may want to check out your battery/alternator too ... oh and your ears ... hmmm

    Second the earth possibility :-
    If you have a 'solid' supply line then you definitely need a 'solid' earth line too !
    Does the install share the earthing point with other equipment ?
    If so, then at switch-on the power will find the lowest electrical resistance path to ground ... which may be via other equipment instead of the intended earth point.
    This is common on older cars and VERY common on old aircraft due to corrosion causing high resistance contact with the grounding point (vehicle shell).
    I would suggest simply adding extra earths (thick cable) on your audio units - if that solves or modifies its behaviour then it confirms the cause and you need to revise the full install.
    '90 535iSE Auto (AE+EAT) 123k miles
    '86 F288 69k miles
    '06('89)- PGE 2.0DOHC Turbo
    '03 A160LE 19k miles
    1914 Stellite E2A (no odometer!)
    (+ others I daren't mention here)
    www.pyghtle.com

  6. #6
    Join Date
    Jan 2004
    Location
    Albuquerque, NM
    Posts
    953

    Default

    Quote Originally Posted by bullyd
    ive got a strange one here, when i turn my stereo on i lose my cruise control and my slow wipers got to intermittent. turn the stereo off and its all back to normal! is there a possibility the stereo is drawing too much power making me lose these or can it be something ive overlooked? ideas would be great! daemon
    Bad connection at the infamous "fusible link"?
    gale
    92 735i 5-spd, turbo project finally underway!


  7. #7
    Join Date
    Aug 2005
    Location
    east anglia uk
    Posts
    266

    Default

    Quote Originally Posted by zygoteer
    Your problem sounds (no pun intended) like it is either a weak power supply cable or a bad common-earth problem.
    I suspect the power supply from your description, but could be the earthing as well.
    Either way its a bad install - if you paid for this work then get them to fix it for free.

    First the supply possibility :-
    At which point did you tap into the power for your (very high powered !) audio units ? ... was it shared with the other equipment ?
    If so, I suspect that when you switch on, it causes a large volt drop in the supply cable, due the high current draw.
    (also means your maximum power/volume achievable is reduced)
    This low voltage then causes the cruise control to malfunction and the wiper speed/interval is probably voltage level sensitive too.
    You need to run a new supply cable (as thick as you can buy, because 2.8kW at 12 volts is over 200 amps ! - roughly the similar to your starter motor) to each unit from as physically near to the battery terminal as possible.
    Difficult to use a fuse here (but good audio units should have their own protection installed internally) or a switch/relay at this current level.

    Hmmm .. you may want to check out your battery/alternator too ... oh and your ears ... hmmm

    Second the earth possibility :-
    If you have a 'solid' supply line then you definitely need a 'solid' earth line too !
    Does the install share the earthing point with other equipment ?
    If so, then at switch-on the power will find the lowest electrical resistance path to ground ... which may be via other equipment instead of the intended earth point.
    This is common on older cars and VERY common on old aircraft due to corrosion causing high resistance contact with the grounding point (vehicle shell).
    I would suggest simply adding extra earths (thick cable) on your audio units - if that solves or modifies its behaviour then it confirms the cause and you need to revise the full install.
    what did you say? couldnt quite hear you

    i did the complete install myself, what you say on power cables makes sense to me so ive picked up some 10mm starter cable from work and will fit as soon as i got a couple of hours spare, will post results, for the ideas!

  8. #8
    Join Date
    Mar 2006
    Location
    Maribor, Slovenia
    Posts
    25

    Default

    My first suspect would be speed signal feed to your stereo. Check the wiring, see to what your black/white wire in stereo harness is connected to, disconnect it and I'm pretty sure your problem will disappear.

  9. #9
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    Apr 2006
    Location
    Chicago, Il. U.S.A.
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    4,243

    Default

    Low voltage can cause all sorts of goofy symptoms.You should be drawing this much juice straight from the battery and not through the vehicle wiring.If not I'll bet that's the cause. Jeez man 2600 watts thats over two horsepower I think.

  10. #10
    Join Date
    Aug 2005
    Location
    east anglia uk
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    Default

    both positive and negative feeds are coming direct off the battery, i will do suggestions here tomorrow as i have a couple of hours free, fingers crossed will find the problem! thanks to all for their suggestions!

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