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Old 02-06-2013, 08:10 AM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
 
Join Date: Mar 2008
Posts: 20,375
Mein Auto: 02 BMW 525i M54 auto 130K
Quote:
Originally Posted by vatoman View Post
At battery car on 13.5 it will go up but not much within spec. In sleep I get odd numbers it fluctuates about .75 but it well drop then rise. Obc shows the alternator at 13.7. So good there I haven't ruled out nav or amp. All I do hear is clicking. Like the actuator flap moving.
You don't mention the units - but if you used the OBC readout, you must be talking volts.
Volts are fine if you're testing the final state of charge of the battery - but for locating "parasites" causing that battery drain, you need to look at amps (essentially amps are the instantaneous slope telling you direction & magnitude whereas volts are merely the final integration of the area under the curve). Volts are great to tell you that your final state is a dead battery - but - amps are what you need to isolate parasitic leakage at any point in time.

Quote:
Originally Posted by vatoman View Post
I'm dead currently going to go buy one of those jumper things sick of asking for jump.
I would recommend against buying a portable car jumper until/unless you FIRST buy a good set of jumper cables and a digital multimeter (DMM)!
Then, buy a good battery charger and a good (long & thick, preferably with an LED on the end for night work) extension cord.

After you have those essential items, then (and only then) would I even consider spending any money on a 'jumper thing".
Personally, I think portable car jump starters are problematic for the following reasons:
  • They cost money, consume storage space, and require maintenance - all of which should first go toward the more essential tools I mentioned
  • They have batteries too - so they wear out just like any other battery - so they're more likely to be dead 10 years from now, than alive, when you need them
  • A 6A charger will charge a battery well enough to start in fifteen minutes (or so) anyway
  • There's (almost) always a 12V battery nearby for emergencies anyway, if you don't have time to charge your battery with the charger
Caveat: I'm not against tools (tools are free), so if you 'really' want that portable jump starter, by all means go get it - but - don't even think about it until you already have:
  • Good jumper cables (thick gauge wire, strong jaws, convenient wrapup)
  • Good DMM (Fluke is my preference - but Craftsman works just as well)
  • Good battery charger (my 4A charger works fine but 6A might be nicer)
  • Good extension cord (mine is 100', LED lighted, and heavy gauge wire)
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Last edited by bluebee; 02-06-2013 at 08:31 AM.
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