Voltege reguletor & cut out edjust with "Smiths" Meter

[Sandun]

Last week I looked at the my car battery charging system Bz i see the Ampere meter very soon come to "0" ( off charging battery come 12.7 volt ) Befor i run the car Battery was 12.3v , then i increase the CUT OUT nut Small amount clockwise - then I run about 15 minute in good speed No on head lights and others - I see the Ampere Meter show 30 ( 0 to 30 meter ) and smith meter show 13 v , this time the Ampere meter not move towards " 0 " with out when the slow speed - it still in 30A - after end i check my battery using digital multimeter ,then it was 12.6v - the regulator/cut out adjustment do damage my dynamo ? my battery is New one (90Ap 12v battery ) the smiths meter like this (look pic) and say what i must do now may i adjust Voltage regulator nut small amount to clockwise [frame][/frame]

[bmcecosse]

I think it's just right Sandun! And your battery was very low on charge, and is now charging up correctly. How long did you run on 'good revs' ? It would need a good 30 minutes. Battery off charge at 12.6 volts is absolutely right. And your meter at 13 volts on charge is also correct - in fact as the battery charges up - it may well rise slightly higher. As long as it stays in the green - don't worry!!

[Sandun]

I have adjust The CUT OUT Nut now, so it not off at the 12.6 volts of battery - I run 15 minutes i think

[bmcecosse]

And the ammeter still shows +30 amps after 15 minutes?

[Sandun]

yes it still 30+ Battery was 12.6v ( 12.58) - I remember before changing cut out settings charging off 12.7v and Ampere meter come to about 15Am it close to 12.6 - so I think 12.7 is battery not a full charge it want to be 13.5 I think so i increase the Cut OUT - but i am afraid it will be damage my dynamo - I note the Smith meter it only 13v not more if i do speed the car

[bmcecosse]

The 'cut out' simply defines when the charging will start -and when it will stop. That is - it will only connect the dynamo to the battery when the dynamo volts are higher than the battery - and similarly it will disconnect when the dynamo volts drop below the battery volts.... So I suggest you leave it alone!! You need to adjust the other coil - which adjusts the feed to the dynamo 'field' coils to increase (or decrease) the dynamo output voltage. It should indeed rise to almost 13 volts with a dynamo - and I still think that either your multimeter reads low (12.58 volts when the Smiths shows 13 ) - or your battery is still very low on charge .. Can you check the multimeter on another car with engine running to see what volts it shows there??

[Sandun]

"your multimeter reads low (12.58 volts when the Smiths shows 13 ) " - The multimeter read 12.58 at the stop car after run 15 minutes - smiths show 13v when the engine run speed-

[bmcecosse]

And does the Multimeter also show 13 volts then?