Guest fasteddy Posted May 30, 2010 Share Posted May 30, 2010 Hi everyone. bear with me this is my first post. I bought my first cabbie yesterday, a 94 mk5b 1.8 si 130bhp. The problem I have is everytime i put the power hood down the battery is flat. The battery light isnt on when the engine is running so is it just the battery needs a good charge or replacing or could it be something else causing it. Also where is the pump so I can switch it to manual until the problem is sorted. Quote Link to comment Share on other sites More sharing options...
Guest shaun Posted May 30, 2010 Share Posted May 30, 2010 Sounds like the battery is knackered.Does the car start after being left over night? The pump is in the boot on left(passenger side)under the lift up flap Quote Link to comment Share on other sites More sharing options...
Guest fasteddy Posted May 30, 2010 Share Posted May 30, 2010 I will find out this morning but yesterday it was starting fine unless the roof had been used. cheers for info on the pump I will go find that aswell Quote Link to comment Share on other sites More sharing options...
Guest shaun Posted May 30, 2010 Share Posted May 30, 2010 Can use my roof afew times opening and closing and battery wont go flat but ive got heavy duty diesel battery on my 1.8 si.... Quote Link to comment Share on other sites More sharing options...
Guest fasteddy Posted May 30, 2010 Share Posted May 30, 2010 Have just been and looked and car started fine this morning have put roof in manual mode for now. is there a particular battery you recommend or will any heavy duty battery be ok. Quote Link to comment Share on other sites More sharing options...
Guest shaun Posted May 30, 2010 Share Posted May 30, 2010 Have just been and looked and car started fine this morning have put roof in manual mode for now. is there a particular battery you recommend or will any heavy duty battery be ok. Most say a heavy duty diesel battery but its what you can afford. does sound like the battery. would have battery checked before you buy new 1 first. have you checked alternater is sending a charge through to battery all the time and not intermition? Quote Link to comment Share on other sites More sharing options...
Guest fasteddy Posted May 30, 2010 Share Posted May 30, 2010 I will have to borrow a meter from work tonight and check but the battery light goes out once the car has started. wouldnt it stay on if the alternator was at fault? Quote Link to comment Share on other sites More sharing options...
gingergman Posted May 30, 2010 Share Posted May 30, 2010 if the alternator was proper buggerd the light would stay on, it might be charging but very little, a multi meter will soon tell you Quote Link to comment Share on other sites More sharing options...
Guest fasteddy Posted May 31, 2010 Share Posted May 31, 2010 Ok I tested the battery this morning it was reading just over 12v. with the engine running it was showing 14.2v and after leaving the engine running for about an hour the battery showed 13.2v Will check again later to see if the voltage drops. Quote Link to comment Share on other sites More sharing options...
Guest georgeking Posted May 31, 2010 Share Posted May 31, 2010 it should be over 14v when car is started and running if not then alternator has had it mate Quote Link to comment Share on other sites More sharing options...
Guest Cabbytech Posted May 31, 2010 Share Posted May 31, 2010 Because there is little terminal voltage difference between a fuly charged battery (12.65v) and a 25% charged battery (12.06v), you might be better using a hydrometer for a more accurate reading, or have the battery drop tested, bear in mind that a slack fan belt can cause charging problems so i would also check that before worrying about the battery or alternator being faulty, Quote Link to comment Share on other sites More sharing options...
Guest fasteddy Posted May 31, 2010 Share Posted May 31, 2010 I think the alternator is ok as showing 14.2v when running so I reckon its the battery either dead or in need of a good charge as car had been standing a while. Will probably replace just for piece of mind. Quote Link to comment Share on other sites More sharing options...
Guest dazzy16 Posted June 1, 2010 Share Posted June 1, 2010 Dont know if this helps, but why dont you just take out the roof relay, the yellow 1, under the right hand side of the dash, that way you can have the car running and lower the roof, thats how my Mk5 Si is!!!!! Quote Link to comment Share on other sites More sharing options...
Guest fasteddy Posted June 1, 2010 Share Posted June 1, 2010 I am thinking about doing that anyway. It will make putting the roof down a lot easier but will still probably get a new battery just so I know im not gonna get stranded somewhere with a flat battery. Quote Link to comment Share on other sites More sharing options...
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