flyingbrick Posted March 23, 2015 Share Posted March 23, 2015 Hi all. Noticed while clamping my alternators batt cable to positive terminal that there is some current draw. I have just measured this at nearly .2 of an amp. Is this normal? I subconsciously assumed that with the motor off there would be zero current flowing back to it. Quote Link to comment Share on other sites More sharing options...
ta63-1uzze Posted March 23, 2015 Share Posted March 23, 2015 should be way less like 0.02 , that would be normal. if its a later model car with a lot of modules then leave the amp meter on it for about 30 mins, they some times tail of after a bit of time. but yeah .2 is far to much that will kill the battery in no time at all start pulling fuses with the amp meter connected and see what circuit is draining the battery Quote Link to comment Share on other sites More sharing options...
h4nd Posted March 23, 2015 Share Posted March 23, 2015 Or if that don't help, get the diodes in the rectifier checked, weak diodes can leak current. 1 Quote Link to comment Share on other sites More sharing options...
Ned Posted March 23, 2015 Share Posted March 23, 2015 Yeah, my modern car will draw more than that for a few minutes after turning the car off/locking it and then drop down to SFA after a little while Quote Link to comment Share on other sites More sharing options...
governorsam Posted March 23, 2015 Share Posted March 23, 2015 .18 was what I was taught as a maximum. Long time ago... Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted March 23, 2015 Author Share Posted March 23, 2015 Just checked. Its actually the alternators sense pin that is drawing the current (I have it connected to the charge wire hence the confusion. Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted March 23, 2015 Author Share Posted March 23, 2015 Pin two Quote Link to comment Share on other sites More sharing options...
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