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post #1 of 11 (permalink) Old 8th October 2010 Thread Starter
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Angry Renault Scenic 1 - dTi Battery Discharging*FIXED*

I have a 1998 Renault Scenic 1.9td and it has suddenly developed a serious problem in that the battery will completely discharge within a couple of hours. I have changed the alternator and the battery this has made no difference. I have also removed the stereo and replaced the relays under the bonnet. This is now driving me mad. there is no visible signs of discharge like interior lights on or boot light or anything like that. The only other sign was that the temperature gage needle would rise and fall with the revs of the engine just like the rev counter and now it no longer works at all. Everything else seems to be working fine. Can anyone help please.
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post #2 of 11 (permalink) Old 9th October 2010
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Re: Battery Discharging

Have you checked if there is a parasitic voltage drain when the car has been switched off and locked - leave it for at least 5 minutes vefire testing.
Also what voltage is the alternator putting out - check at idel and then at around 2,000 rpm.
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post #3 of 11 (permalink) Old 9th October 2010 Thread Starter
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Re: Battery Discharging

Unfortunately have not tested for parasitic voltage drain as yet as I need an amp meter. However I have tested the charging of the alternator with a multimeter at idle voltage is 13.2v and at 2,000rpm voltage is 14.3v. This is a new alternator and battery fitted since the problem came to light. I intend to purchase an amp meter from maplin this afternoon as I suspect parasitic voltage drain is the cause, the lack of circuit diagram does not help either in diagnosing the fault.
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post #4 of 11 (permalink) Old 9th October 2010
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Re: Battery Discharging

Could you not set your multimeter to amps and check between the disconnected postive terminal and the battery? If it more than the multimeter can handle then it must be very high indeed.
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post #5 of 11 (permalink) Old 9th October 2010 Thread Starter
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Re: Battery Discharging

Have now checked parasitic drain it is way to high the meter I got can read up to 20amp the reading is way above this. I have managed to fix the temp gage and doing some diagnostics I have found that if I disconnect the cable leading from the starter to the alternator then the drain subsides to within 200ma. Although disconnecting from the alternator made no difference. I have noticed that the cable from the starter to the alternator has a branch in it, I think that the fault may lye at the termination of this branch where ever this leads to. Oh yes bye the way to answer your question my multimeter can read amps but only in ac mode, very strange I know but there you have it.
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