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window rollup module basics


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catback 
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Joined: August 13, 2002
Location: Canada
Posted: July 06, 2014 at 12:01 PM / IP Logged  
howie ll wrote:
It just occurred to me that if the power supply sits at ground with the ignition off and you only use the window closer with ignition off, you won't need a relay since all the wires will be at ground.
Odds are the power wire doesn't sit at ground when the ignition switch is off. It just shows a path to ground through other stuff that sit on the same circuit.
'83 Mercedes, come on now it's about time to move into the modern era, after 31 years, and buy a new car with window roll-up and other amenities built-in. window rollup module basics - Page 2 - Last Post -- posted image.
808pants 
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Joined: March 23, 2014
Location: Hawaii, United States
Posted: July 06, 2014 at 5:02 PM / IP Logged  
catback wrote:
'83 Mercedes, come on now it's about time to move into the modern era, after 31 years, and buy a new car with window roll-up and other amenities built-in. window rollup module basics - Page 2 - Last Post -- posted image.
hmm...I'm awaiting Windows 9?
Actually the diesel 300SDs and similar models are legendary and sought-after for their longevity, eg 500K miles and much more with reasonable maintenance - to say nothing of their tolerance for running on alternative fuels with little or no modification (waste vegoil, for example). I do wish I could buy a 2014-anything that could do the same, especially something less than 17' long.
Dave
howie ll 
Pot Metal - Posts: 16,466
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Joined: January 09, 2007
Location: United Kingdom
Posted: July 06, 2014 at 5:45 PM / IP Logged  
Catback's, bet it does sit on solid ground, test and if so worth a try but I don't really care I must have 100 relays lying around.
Pants, your absolutely right I've worked on two recently, both owners have had them from new and commented on NO COST running.
oldspark 
Gold - Posts: 4,913
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Joined: November 03, 2008
Location: Australia
Posted: July 07, 2014 at 1:34 AM / IP Logged  
Thank you Howard.
"It just shows a path to ground through other stuff that sit on the same circuit. " means it is at ground.
How grounded? - add up all the parallel resistances, or try grounding a 3W or 10W or 55W or 100W bulb thru turned off IGN.
808pants 
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Joined: March 23, 2014
Location: Hawaii, United States
Posted: July 07, 2014 at 2:53 AM / IP Logged  
In my case, at least, no, there's no chance ground available by just keying off - though I'd love to find an even easier way around this, so I'm attaching the musty old schematic and maybe someone will see something I don't/can't.
I think Catback might have been referring to the "impression of a ground" that you'd get from an ohmmeter reading through, say, a filament of an indicator lamp that happens to tie into that hot-lead - and thence to ground. But try to USE that lead as a ground with a low-impedance device like a window-motor, and most likely all the voltage drop will be across the filament. window rollup module basics - Page 2 - Last Post -- posted image.
Dave
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: July 07, 2014 at 3:15 AM / IP Logged  
Have you tested that power supply (supplies) to the window switches (can't read your too small diagram), I'm sure one is BLACK / YELLOW with a DMM with the ignition off?
In other words both motor wires to each motor should rest at ground.
oldspark 
Gold - Posts: 4,913
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Joined: November 03, 2008
Location: Australia
Posted: July 07, 2014 at 5:00 AM / IP Logged  
With old vehicles there was a reasonable chance of a 2-4 Ohm GND thru the IgCoil alone.
But as Howard suggested - TEST. The number of times we have used phantom- or pseudo-grounds like this for anything from LEDs buzzers & relay coils to lamps of reasonable current.
And if it can actuate a relay coil...
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