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Model specific boards => Golf mk4 => Topic started by: GTIcheeseman on 19 June 2012, 17:57
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right on my 1.8t agu i have an electrical issue which is,
the power dims, lights flicker, and the abs light flashes and usually says a mixture of these things, brake fault, alternator workshop, service manual, stop....and also beeps which really does my head in!
now its got a brand new batttery and had to new alternators and been checked by a local auto elecy and all they found was a faulty earth on the gearbox.. they checked the whole car over all earths and as much wiring they could find. a mate at halfords checked the battery and said its fine
now when i do the windows they seem to take the power which usually sets this off but as its so random and i really mean its random. but other times it just does it when the car seems to go above 20 mph. i have checked the battery and its getting the right volts but when this drop happens it goes down to about 12.3 volts for a split second then back up. i have also done the usual of checking the fuses on the battery and fuse box. also the black box under the dash board the convenience control unit clicks like mad makes the dash go mental. also sometimes i cant lock my car, the alarm sets and flashes but the door pins dont go down but the boot will lock. this happens for like 5 mins then go back to normal. plus sometimes the alarm goes off when i lock it and wont turm off.
now this fault is reaaaaaally intermitent, and usually goes away when i turn the car off.
the only fault code i get is battery power supply terminal 30 low voltage
if i think of any more info ill add but theres my fault i dunno if its all connected but try and help figure it out :) vw say it could the the black box but they need to plug it in to find out
also vw say on my agu 1.8t 99 im supposed to have a 109 relay is that true??
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any helpers??
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Wow, sounds like u have an electrical fault from hell. I got electrical issues myself but cant find the source yet so cant help. I popped in Vw stealers today for a relay 100 and they said the number printed on it has changed a few times since the oringinal. So if your gona replace relays i would use same number to be safe. otherwise cant help m8.
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oh hmmm i have a relay 100 lol yeah when it plays it, it plays up! lol
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can you get vag com on it and see what it comes up with or if anything comes up :undecided:
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dont know anyone with it
i have an ecs scanner (i know its not the same) but on that its not finding any codes
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there must be someone localish to you who has got it and would do a proper scan for a few beer tokens
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if there is anyone near kent let me know
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Ben @ parsons performance is Great with electricals, and has full vag com.
Lovated in blackboys, near uckfield. Not far innthe great scheme of things
Give him a call :smiley:
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Cheers :)
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i know you have had everything checked over but theres a small fuse box that lives on top of the battery. theres a few large amperage fuses in there. try changing these. also ave a little peak at the thick cables that leave the back of the box. might be loose or something
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Done that more than once
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any one else?
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Sounds like a chassis ground fault.
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they all got checked :/ although it hasnt happened for a few weeks atm
does anyone know where the main earth points are
gearbox
underneath battery
cant think of the others for the minute