porter_jamie Posted June 29, 2009 Report Share Posted June 29, 2009 voltage reading, with all connected up: with battery A (small one off a scooter or something, but weights little) 17+ volts with battery B (varley redtop 8aH, but is huge and weights lots) 14.2V is battery A toast, or do i have bigger issues? Link to comment Share on other sites More sharing options...
buster Posted June 29, 2009 Report Share Posted June 29, 2009 I take it thats with the engine running? Should normally be in the region of 13 to 14.5 volts, if volts are changing, then its probably due to different battery impeadance causing different current to be drawn. What are the battery voltages when off the bike? Link to comment Share on other sites More sharing options...
porter_jamie Posted June 29, 2009 Author Report Share Posted June 29, 2009 I take it thats with the engine running? YES Should normally be in the region of 13 to 14.5 volts, if volts are changing, then its probably due to different battery impeadance causing different current to be drawn. What are the battery voltages when off the bike? bat a = 12 to 8,5, depending on how long since last charge bat b over 12 Link to comment Share on other sites More sharing options...
porter_jamie Posted June 29, 2009 Author Report Share Posted June 29, 2009 I presume this with engine running? YES mille - Which battery did you try first - battery A or B? If it was battery A what happens if you go back to battery B? jamie -A first - didnt go back to A as was at dyno and clock was ticking. Batt A is new as in never tried it before, Batt B has worked for 2 seasons no issues. mille Is the regulator/rectifier getting warm at all when running battery A? jamie YES, seems to be warm - with Batt A anyway. I kept an eye on the voltageand it was right on 13. whatever the whole time (on big battery) mille- if neecesary stick the re/rec in the fridge for a few hours to cool it and then plug it and run the engine asap and feel whether it warms up gradually or quickly.. mille - Have you checked the reg/rec earth? jamie - NOPE - will do mille - Alternator, battery and regulator/rectifier need to be matched as a system - if the small battery does not draw enough current even when discharged to cause the regulator to kick and dump excess voltage and turn it into heat then it will result in high volategs at the battery overcharge the battery. Where has the alternator and reg/rec come from? jamie - ITS FROM A BRIT BIKE 3 PHASE LUCAS REPLACEMENT, AND THE ALTERNATOR IS STANDARD 3 PHASE ROTAX. NO SPECS AS FAR AS I AM AWARE. i found this: http://www.electrosport.com/technical-reso...ing-diagram.pdf so i shall follow it to see what happens - the last thing says duff battery ps i need to work this quoting lark out Link to comment Share on other sites More sharing options...
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