Mr2gtracer
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battery discharge
Hey guys,
i've just replaced my battery and now the battery discharge dash light comes on.
I didn't have this with the last battery, even when it died.....
Any suggestions?
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MRTurbo
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Re:battery discharge
2012/05/18 19:49:39
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1990 SW20 GT 3S-GTE Targa 2001 Honda CBR600F4i 
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Mr2gtracer
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Re:battery discharge
2012/05/18 19:53:38
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Possible. My mechanic didn't say anything about it when he checked the car out :(
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dasic1
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Re:battery discharge
2012/05/18 21:42:38
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Put a muilty meter on the battery while the car is running and see how much volts its got.
Also cheek your earths on the engine
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cogs
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Re:battery discharge
2012/05/18 23:26:44
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It's too much of a coincidence, was the battery inadvertently connected backwards, ie. neg to pos when it was replaced? Even just a quick splash of reversed polarity can kill the alternator diodes which would turn on the charge light.
Also, if your old battery went completely open circuit while the engine was running this can kill several components in the alternator. I always shudder when I hear of people disconnecting the battery on a running engine to check if the alternator is working - it can cause damage, particularly if there IS another undiagnosed fault.
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Mr2gtracer
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Re:battery discharge
2012/05/19 08:31:56
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It could have been connected backwards. I've had a look and everything looks fine. The car runs, the dash, gauges and stereo works. The only thing i've found was that my headlights did't work (parkers did though)
i'm really getting ticked as i just want my car to run smoothly haha.
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MANDALAY
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Re:battery discharge
2012/05/19 08:41:35
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IIRC the light in the dash is the alternator light.
So with the engine running and a multimeter check the voltage from the post on the alternator to the body .
What is the voltage ?
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Mr2gtracer
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Re:battery discharge
2012/05/19 09:46:15
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I'm getting a multimeter today to find out.
The strange thing is that before my other battery died (still no idea how) the battery light was not on.
That was when i got it towed to the mechanics, and after they fixed the issue i drove home and around the beaches the next day with no warning lights on at all.
I've only seen the light on after the new battery was installed.
The car runs fine, i'm just worried that if i take it out i'm going to stop in the middle of nowhere
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cogs
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Re:battery discharge
2012/05/19 10:16:21
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So you had a day's running around with the new battery BEFORE the charge light came on? In that case it's probably unrelated to the battery replacement.
Batteries can die suddenly, it's no mystery - they just get old and the plates fall apart. Alternator brushes also wear out, connectors work loose, electronic components fail, etc. Forget about the new battery and just diagnose your current fault.
Are you sure it's the "battery discharge" light that's on? I seem to remember that when the alternator light comes on it also turns on a couple of others, but I might also be thinking of a different car! Some MR2s also have a battery electrolyte level light, could it be that coming on?
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Mr2gtracer
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Re:battery discharge
2012/05/19 10:33:54
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I had a day's running with the old battery, not the new one. The battery night came on after the new battery was connected.
I didn't have the fault until the new battery was put in
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Mr2gtracer
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Re:battery discharge
2012/05/19 14:57:19
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After having a look around i'm thinking that something isn't earthed properly (nice one dasic1) but i can't find where.
I'm checking all the lines from the terminal points and from the alternator but can't see which is shorting :(|
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Rizo
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Re:battery discharge
2012/05/19 16:42:06
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13.2 volts on a new battery with the car turned off. 14.5 volt with the car running and alternator charging.
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Rizo
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Re:battery discharge
2012/05/19 16:44:44
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A good test to do is a earth continuity check between the negative terminal of the battery and the disconnected earth terminal on the alternator. This will show if you have any loose earth connections before the alternator circuit.
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Mr2gtracer
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Re:battery discharge
2012/05/20 09:51:38
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Good news everyone, the battery issue has been fixed. I took the battery out and had a look at the terminals ans the wires from them. It appears that there was a wire on the positivr end that wasn't connected. So i fixed that up and started the engine - no battery light
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Reddtarga
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Re:battery discharge
2012/05/20 10:28:53
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Was that the fusable link?
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