98 expedition window problem

My 98 Expedition driver window will often not go down or will stop
midway intermittantly.
Changed the motor and the proble continues. Turns out when the switch
is depressed the motor is only getting 8 volts (in the window up
direction it gets the full 12 volts). Swapped out relays and no change
in symptoms.

All ideas on solving this problem are appreciated.

TIA,

Mike

I really don't know but perhaps this will help.

There is a current limiting device that prevents the (dc) motor from
burning up if you hold the switch down. I thought it was internal to
the motor but I suppose it doesn't have to be. Might be worth looking
into. When a dc motor stalls it draws a lot more current. The
current limiting device will then drop the applied voltage (to the
motor) to keep the motor from burning up.

Double check that you get 0 volts across the switch when you activate
it.

You need to find out where the (12 - 8 =) 4volts is being dropped
across. It is something between the motor and the battery ... for
sure.


On 29 May 2006 10:30:46 -0700, michaelmcentee1 RemoveThis @yahoo.com wrote:

>My 98 Expedition driver window will often not go down or will stop
>midway intermittantly.
>Changed the motor and the proble continues. Turns out when the switch
>is depressed the motor is only getting 8 volts (in the window up
>direction it gets the full 12 volts). Swapped out relays and no change
>in symptoms.
>
>All ideas on solving this problem are appreciated.
>
>TIA,
>
>Mike