1. I think you mean a meter on amps across the battery. Any digital meter will certainly handle 12 volts input on the ohms range. An analogue one might bend the needle round the end stop !!
Jim On 24/05/2010 22:30, Jamest142 wrote:
Hiya Just a few thoughts... 1/ Don't put an Ohm meter (or Multimeter on Ohm setting) directly across the battery - if the battery has any power left at all, the meter will short, and the meter will let the magic smoke out. A good battery will melt a spanner across the terminals, and the Ohm meter will pretend to be an spanner for a very short period of time... 2/ The measure if you have any current drain, then the need to connect the meter - in the highest Amp range - in series with the battery +ve, and the rest of the car. ie - diagram below:- Metalwork -> Battery -ve -> [Battery] -> Battery +ve -> Amp Meter -ve(Black) -> [Meter] -> Amp Meter +ve (Red) -> Car +ve Wire (Red) As the previous post - don't try to start the car - this will blow the meter as well. This will show any significant drain on the battery whilst standing though. 3/ The Voltage measurements are correct for a battery at rest, and being charged by the alternator though. Put the headlights on main beam, and measure when the engine is running - this will highlight any bad earths (and if the lights are dim it will show if the alternator is giving Volts, but no Amps) I suggest you charge the battery, remove the +ve terminal, and measure from the engine block to the +ve on the Voltage setting, this should give the same reading as direct voltage across the +ve and -ve on the battery. If this is ok (12.6V ish) then the earth connection is ok. Although you have got a new battery - have you cleaned the inside of the battery clamps themselves - they can get gummed up, and this would also cause the funny readings. I would also clean the earth straps (and where they bolt onto). When measuring - ensure the connection points at each end of the meter are clean. Just a few thoughts. Best regards James T (Q2-002)
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