Question about Rover 75
Battery keeps going flat, any ideas?
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: my range rover baterk keeps
if the battery goes flat overnight but works fine when driving there are only two possibilities. either the battery is faulty and not holding charge or there is a current drain on the electrical system when standing. have your battery drop tested if ok check that current drain does not exceed 50 miliamps with everything switched off . common causes of drain are boot lamps, glove box lamps, faulty relays, faulty cigarette lighter sockets,and leaky diodes in alternator. to check for these try pulling fuses one at a time to find the faulty circuit. hope this helps
Posted on Mar 27, 2009
looks like you have something draining the battery (something electrical staying on) disconnect your battery negative terminal and connect a test light between the battery post and the wire clamp if the light comes on you have battery drain (make sure interior light is out when testing) you now need to go through all elctrical systems to trace the reason why ( check boot light goes out first this was a favorite cause)
Posted on May 02, 2009
You have what we call a parastic load aka key off drain.Disconnect the negative battery cable from its post and put an ammeter in series with post and cable.
Then start pulling fuses until voltage returns to normal.You can do this with a test light too, however the ammeter is more accurate. I'm not sure what is the amperage draw limit for your vehicle is but as a guide line figure at about a half a volt or 0.50 amps.
Posted on Apr 01, 2010
Testimonial: "This sound good what should i expect my ammeter reading to start with?"
Could be your alternator is bad,belt is loose,Autozone will test for free,also check the fusible link at positive battery cable,could be burnt or melted.,
Posted on Nov 23, 2012
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