Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: Webby the Bear on 17 December 2012, 21:40:47
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evening folks. Taking my omega to school on Wednesday to do a hydrometer test on the anti freeze. Want to also check the battery to see how good it is. I have use of a multi meter. So what do i do? Simply put the red probe on the positive and black probe on the negative terminal? If so what should the reading be? Cheers :-)
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http://www.omegaowners.com/forum/index.php?topic=90619.0
:y :y
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Set multi to 20v and yes red to + black to - or reading will have - in front of numbers eg -13v
normal voltage about 12.5 if 12v bit flat mate Hope that helps you out :y
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oops. Sorry didnt think to look for something like this. Cheers Andy :-)
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cheers symes :-)
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Worth checking your Multi-Meter alongside another one also. They CAN be way out.
About 5 weeks ago, there were some electrical gremlins on my Mothers Renault. I checked the Battery Voltage with the Multi-Meter I keep in my boot and it was showing 15.6v on idle. Straight away an indication something is not quite right. For some reason, I questioned the result and tested my own car. This time it showed 15.4v at idle.
I don't have that multi-meter anymore.
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I cant get to the link at the moment as on my phone but i presumed i should be checking voltage with car off. If i then turn car on should i see a drop in voltage?
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I cant get to the link at the moment as on my phone but i presumed i should be checking voltage with car off. If i then turn car on should i see a drop in voltage?
The voltage should RISE when the engine is running as the alternator is now working.
Have a good read of Kevin's guide to battety and alternator checking .. :) once you can get to the link.
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See if they've got a drop tester at college. This checks the voltage under heavy load, so gives a better indication than a multimeter.
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thanks for all the pointers guys. Tested a couple of batteries. One on an avensis. 12.5 then started. It quickly dropped to just above 10. Then went to 14. 4. Teachers said that was good :-)
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thanks for all the pointers guys. Tested a couple of batteries. One on an avensis. 12.5 then started. It quickly dropped to just above 10. Then went to 14. 4. Teachers said that was good :-)
The lower it drops when cranking the better really.
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thanks for all the pointers guys. Tested a couple of batteries. One on an avensis. 12.5 then started. It quickly dropped to just above 10. Then went to 14. 4. Teachers said that was good :-)
The lower it drops when cranking the better really.
It's a measure of the battery's internal resistance, so less drop means less resistance = better.
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I feel I need to clarify Roberts post above! ;D
If standing voltage is 12.5 and the voltage drops to 10.0 when cranking, that will be better than 12.5 at standing and 9.2 at cranking.
So, if a healthy battery of 12.5volts (standing) has a reading of 11.3volts at cranking, it's a sign the battery is doing a very good job.
Not the LOWER the drop (even though that grammatically makes sense in a way) but the LESSER the drop, the better.
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I feel I need to clarify Roberts post above! ;D
If standing voltage is 12.5 and the voltage drops to 10.0 when cranking, that will be better than 12.5 at standing and 9.2 at cranking.
So, if a healthy battery of 12.5volts (standing) has a reading of 11.3volts at cranking, it's a sign the battery is doing a very good job.
Not the LOWER the drop (even though that grammatically makes sense in a way) but the LESSER the drop, the better.
+1 :y