Rear Window Motor Drain?

[louie2034]

Hi everyone, I just bought my 1986 eddie bauer edition and I have .47 current draw coming from somewhere. Is the rear window motor a hot wire? Ive gotten a new battery, alternator because the forums were saying the internal regulator could be a problem and I cant figure it out. Ive disconnected the cig lighter, I took out the radio, took out the dome light, I really dont know whats left as far as interior things. I took out that light on the driver side in the back too. I just disconnect the battery every night and she runs perfect, but that gets old. and one last question, the setting on the multimeter to check for a current draw is 10 dca, right? Thanks in advance. Luis

 

[Rons beast]

Maybe I'm too old school. The best way i found to locate a draw is to disconnect the ground cable, and jump it with a test light. If the light glows bright, you have a draw.

Then you remove each fuse, one at a time, until you find the one that makes the light go out. Whatever is causing the draw is on that circuit. Just be sure to have the doors closed or the switch dissabled while doing the check. Saw alot of young guys pull their hair out, while they had the dome light on the whole time.

Just a bit of info, I had the same problem. turns out the glovebox door was not closing tightly.

Good Luck

 

[Seabronc]

Welcome to the Zone /emoticons/[email protected] 2x" width="20" height="20" /> . Ditto Ron's post, there is nothing like an organized approach at trouble shooting.

Good luck,

 

[rabbit]

I had the same thing on my 86. turned out it was the electric chock. There is a relay on the driver side fire wall pull the wire harness off of it over night. and see if your battery stays charged

 

[Rons beast]

A factory electric clock in proper condition will not discharge a battery overnight. The problem would have to be the bad relay connecting some other deice with a much greater draw.

 

[louie2034]

Thanks alot guys, I guess Im gonna have to go get a test light. I disconnected the rear window,not that, disconnected the harness off the chock, not that. gonna go chasing a circuit. Im assumin its a relay cuz ive tried everything in the inside compartment

 

[miesk5]

yo,

re; "...the setting on the multimeter to check for a current draw is 10 dca" correct

Have to have battery tested, although new since it is below 0.50A

May as well have alt checked for free too.

Parasitic Draw; Diodes inside the alt could be shorted, thus causing drain, but the it would still put out 12 Volts, and pass the Voltage Output Test, however it could not put out full current, and would fail the Current Load Test.Remove & Charge Battery and take voltage reading (should be around 12.6 volts). Disconnect alternator, then re-install battery for a day or so & then check batty voltage again; if no drain, then diodses are prob the issue. or Take alt it to a parts store where they can BENCH-test it for free. BTW, The voltage should be between 13.0 and 15.0 volts w/engine idling. by miesk5 at Ford Bronco Zone Forums http://broncozone.com/topic/22079-battery-drain-when-off/

READ MORE

Possible sources of current drain are vehicle lamps (underhood, glove compartment, luggage compartment, etc.) that do not shut off properly.

Also a hung-up relay (contatcs fused together, etc.) can draw through the Fusible Links that are rated way above that parasitic draw rating. Typically, EEC Power and Fuel Pump

EEC Power Relay Location in an 86; "...On some 86's (like mine) you will find the EEC Power Relay in the cab to the right of the gas pedal...sorta where your ash tray would be..." Source: by Xris

Or, mounted behind the air filter box; pull em and check for draw again.

=======

Also, I have some later year Alternator tests in my site @http://www.broncolinks.com/index.php?index=74

such as;

Measure voltage at B+ terminal on the back of the generator, Circuit 38 (BK/O).Is voltage at B+ terminal equal to battery voltage?

 

[louie2034]

So was about to buy a test light but I decided to go unplugging things until the drain stopped. So i tried a lot of things and then I unplugged this big plug with a butt load of wires right underneath a/c next to the eec power relay and the drain stopped. B4 this, a noise came from underneath the hood everytime i put the ignition to the ready position and it came from the driver side back corner of the engine compartment near the brake booster. Now that relay doesnt make any noise now. And when i put my voltameter in circuit to check for drain, it would make that noise, but now no noise. Any deductions?