Voltage drop using power windows

[B-Co Kid]

1987 ford bronco carb'd 351w. When using both power windows simultaneously, the voltage drops just a little bit, and when the windows are all the way down, still holding both down buttons, the voltage reading drops all the way to the left. Is this normal?? If not, what could cause the absolute drop in the voltage gauge with both down buttons depressed?? I recently replaced and checked all major connections ie. Batt + to solenoid, to starter, and batt - to block. Same thing happens. All windows work, front and rear, but are not as fast as I think they should be. Front and rear windows have new motors also. so I can't figure out this problem.

 

[Krafty]

if you're holding the button for them to go down after they are all the way down then its just the motors straining to try to keep moving. the more resistance an electric motor encounters the more power it has to draw to work, ive seen this with very large motors running feed mills with built in amperage gauges.

operating with no grain, no resistance at 8 amps. loaded with grain moderate resistance 12 amps, one of the covers rubbing on the mill wheel causing severe resistance it still operated but at 19 amps on a 20 amp 220 volt circuit.

so unless you want to burn out your motors or break something I would stop holding the button down after they go down. if you think the windows aren't moving fast enough try lubricating the window sliders and window track bushings.

 

[B-Co Kid]

It was just something I noticed and wasn't sure if there was a problem elsewhere. Thanks for the info

 

[miesk5]

yo,

Also, clean the groves in glass weatherstrips; where glass slides against; I use tongue deressers (dont' ask...lol) and rag dipped in dish wash soap.

**** regulator inside door

then

Body Maintenance from 96 Bronco Workshop Manual; "...Regular body maintenance preserves the vehicle's appearance during the life of the vehicle. The following steps are suggested as a guide for regular body maintenance: Vacuum interior thoroughly and wash vehicle. Check all openings for water leaks and seal where necessary. Cement all usable, loose weatherstrips, using Weatherstrip Adhesive E8AZ-19552-A or equivalent meeting Ford specification ESB-M2G14-A. Replace all door weatherstrips that are damaged or worn. Apply Silicone Lubricant C0AZ-19553-AA or equivalent meeting Ford specification ESR-M13P4-A to the weatherstripping. Replace all cracked, fogged or chipped glass. Align hood and doors if necessary. Inspect windshield wiper blades and replace if necessary. Tighten scuff plate and garnish moulding screws. Refer to Section 01-05. Clean seats, door trim panels and headlining. Apply touch-up paint to chipped or scratched areas. Drain holes should be cleared periodically..."

miesk5 Note, test the silicone on a regular styrofoam cup first; if the cup gets funky or melts, then the can or tube contans oil, a regular occurrence now, esp if from China