[urq] 0.15A constant drain on the battery

[Joshua van Tol]

On Feb 4, 2009, at 10:22 PM, Louis-Alain Richard wrote:

> 2nd update : still 150mA, but before dismantling the oil cooler  
> shroud (that
> is stuck in ice from the last snowstorm) to get to the alternator,  
> I read a
> bit. If a diode is dead, the ALT light should glow with ignition  
> OFF. Not
> the case, so I bypassed the alternator test for now.
>

Not necessarily. In fact, I really don't see how that could be. If  
one of the rectifier diodes (of which there are 6) shorts or  
partially shorts, it would not cause the alt light to glow. However,  
a faulty voltage regulator could do that. I think though that even  
then, that shouldn't happen, because power to the light is switched  
(I think) from the key.


> In the Bentley there is also a diagnostic procedure for a current  
> drain test
> (page 27-15):
>
> - turn off ignition switch, radio and all lights but leave rear window
> defogger switch and air conditioning switch ON
> - disconnect ground cable
> - connect test light between ground cable and negative battery  
> terminal
> - if test light burns brightly, something is switch ON or shorted
> - if no faults are found in fused circuits disconnect cables from  
> non-fused
> components : alternator, starter, ignition system and dashboard  
> instruments.
>
>
> So there is two more things to test, the instrument cluster and the
> coil/distributor, in addition to the alternator.
>
> Can someone help me understand why leaving the defrost and the AC  
> on the ON
> position for a drain test ?
>
> Louis-Alain
>
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