[W126 Coupe] Long term Battery drain problem

[Jim Ham]

I'd take a close look at the wipers. 6A is about right for a stalled wiper 
motor. The parking switch is a wiping contact, so with age or misadjustment 
the contact may be on the hairy edge of making or not making when the 
wipers are mechanically parked. Under these conditions temperature and 
humidity could cause the contact to intermittently make.

This may seem off the wall, but it seems that most solutions at this point 
are pretty implausible.

Regards,

Jim Ham


At 07:36 AM 3/14/2006, you wrote:
>Hi Steve,
>
>  I was thinking about that, but I think I might try the rear heated 
> window first just to prove the theory on that one either is,or isn't correct.
>Thinking about it, you are most likely correct about the contacts being 
>corroded or poor to say the least. One thing I didn't mention previously 
>is the last time I drove the car and needed the rear heated window to 
>de-mist, it didn't seem to be working very well. It used to. So putting 2 
>and 2 together, bad contacts would certainly be suspect on that one. 
>Trouble is though, with this relay having a timer built into it, it ties 
>in with the intermittent current draw and could be more likely the timer 
>circuit coming on and off randomly and still feeding the heated window. 
>Only difference being it's not getting the full current because of bad or 
>dirty contacts.
>
>All speculation at this point, but once I have tried replacing the relay 
>and pulled fuse#3 and got a result (one way or the other) I will take it 
>from there and then open up the relay.
>
>Thanks,
>Vance
>
>

<snip>


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