Reply
 
Thread Tools Display Modes
 
Old 10-25-2011, 12:16 PM   #1
Senior Member
 
ANZAC's Avatar
 
Join Date: May 2011
Posts: 1,005
Plugged trailer in = battery flat

I plugged my trailer in Monday to charge the brake battery which I had just replaced. I switched the key to the aux position, which provides power to the 7 pin connector.

I left it like that for about 6 hours, then moved the key back to off and removed the key and locked the van.

Then this morning the van battery was dead. I had noticed yesterday the brake controller light was on, even with the key out. (I assume it came on when I plugged the trailer in) it is a Tekonsha, but I haven't looked it up yet.

The wiring for the brake controller looks really bad, wires poking out everywhere. The van does have the factory trailer wiring, so I assume it has the extra relay etc under the dash.

On my old van, I wired in the brake controller and had no issues with the trailer.

I'm thinking either:

1) the brake controller and aux power is mis-wired under the dash to the 7 pin.

2) the safety switch on the trailer is faulty and is drawing power all the time.

Any ideas?
__________________

__________________
Sportsmobile-less.

"A job worth doing is worth doing at least twice."
ANZAC is offline   Reply With Quote
Old 10-25-2011, 04:28 PM   #2
Senior Member
 
86Scotty's Avatar
 
Join Date: Jul 2011
Location: TN
Posts: 8,491
Re: Plugged trailer in = battery flat

both are possible. If you want to go through your wiring, go to Etrailer.com and look on their diy/install pages. i found everything i needed and more there and wired all of my stuff myself. Pretty odd to me that it killed your truck battery so quick, especially after it sat awhile since they usually build back up. You've got a dead short somewhere!
__________________

__________________
Currently vanless. Weird.
86Scotty is offline   Reply With Quote
Old 10-25-2011, 09:57 PM   #3
Senior Member
 
rockbender's Avatar
 
Join Date: Sep 2010
Location: Bend, OR
Posts: 799
Re: Plugged trailer in = battery flat

My work pickup brake controller does the same thing - the light remains on as long as I've got a trailer hooked to it. Being a small LED light (not sure what other draws there might be?) I've never had an issue with a dead battery or even low battery the next morning when left plugged in overnight.

I think I might point the finger at other power draws while the key was in the AUX position for 6 hours.
__________________
Josh
2009 Express AWD, CCV Top & 50-ish home build. Daily driver/camper/kid hauler
rockbender is offline   Reply With Quote
Old 10-25-2011, 11:52 PM   #4
Senior Member
 
carringb's Avatar
 
Join Date: Jan 2009
Location: Corvallis, OR
Posts: 4,630
Re: Plugged trailer in = battery flat

Quote:
Originally Posted by rockbender
My work pickup brake controller does the same thing - the light remains on as long as I've got a trailer hooked to it. Being a small LED light (not sure what other draws there might be?) I've never had an issue with a dead battery or even low battery the next morning when left plugged in overnight.

I think I might point the finger at other power draws while the key was in the AUX position for 6 hours.

I agree. My brake controller will stay on for a week at a time between drives, since spring time the van is hooked to a trailer more often than not. AUX does energize a lot of circuits.
__________________
2000 E450 dually V10 wagon
carringb is online now   Reply With Quote
Old 10-26-2011, 12:01 AM   #5
Senior Member
 
ANZAC's Avatar
 
Join Date: May 2011
Posts: 1,005
Re: Plugged trailer in = battery flat

Quote:
Originally Posted by carringb
Quote:
Originally Posted by rockbender
My work pickup brake controller does the same thing - the light remains on as long as I've got a trailer hooked to it. Being a small LED light (not sure what other draws there might be?) I've never had an issue with a dead battery or even low battery the next morning when left plugged in overnight.

I think I might point the finger at other power draws while the key was in the AUX position for 6 hours.

I agree. My brake controller will stay on for a week at a time between drives, since spring time the van is hooked to a trailer more often than not. AUX does energize a lot of circuits.
I thought aux only powered trailer and 2nd Ford batt?
__________________
Sportsmobile-less.

"A job worth doing is worth doing at least twice."
ANZAC is offline   Reply With Quote
Old 10-28-2011, 06:39 PM   #6
Senior Member
 
ANZAC's Avatar
 
Join Date: May 2011
Posts: 1,005
Re: Plugged trailer in = battery flat

Ok something else is going on here, the trailer is long since unplugged but the battery is still going flat. I measured about a 1.5A draw with the doors closed and everything off, but that's with a mostly dead battery, could draw far more with a charged battery. I guess I need to start pulling fuses to isolate. I don't think the clock in the radio draws that much, unless maybe it was trying to reload the discs.

I pulled the ground wire off and I am charging the battery, will try and figure it out tomorrow.

Radio, lights are all off. Scan gauge unplugged. Keys out of ignition.

Yes my cruise switch recall has been done.
__________________
Sportsmobile-less.

"A job worth doing is worth doing at least twice."
ANZAC is offline   Reply With Quote
Old 10-29-2011, 06:32 PM   #7
Senior Member
 
ANZAC's Avatar
 
Join Date: May 2011
Posts: 1,005
Re: Plugged trailer in = battery flat

The current drops to 1.1A after the CD changer reloads. I pulled the radio fuse and current went to 0. Drawing 1A when off doesn't sound right... I haven't found anything else tied into that circuit. Next step is pull the stock deck out and unplug it.

Jage can you move this thread into electrics pls?
__________________
Sportsmobile-less.

"A job worth doing is worth doing at least twice."
ANZAC is offline   Reply With Quote
Old 10-29-2011, 07:20 PM   #8
Site Team
 
BroncoHauler's Avatar
 
Join Date: May 2007
Location: Southern New Mexico
Posts: 9,240
Re: Plugged trailer in = battery flat

Quote:
Originally Posted by ANZAC
The current drops to 1.1A after the CD changer reloads. I pulled the radio fuse and current went to 0. Drawing 1A when off doesn't sound right... I haven't found anything else tied into that circuit. Next step is pull the stock deck out and unplug it.

Jage can you move this thread into electrics pls?
1A for a CD Changer sounds high to me too.

BTW, topic moved to Electrical/Electronics. Let me know if I didn't do it properly. Looks fine from my computer.


Herb
__________________
SMB-less as of 02/04/2012. Our savings account is richer, but our adventures are poorer.
BroncoHauler is offline   Reply With Quote
Old 10-29-2011, 07:25 PM   #9
Site Team
 
Ford_6L_E350's Avatar
 
Join Date: May 2007
Location: Washington - Ridgefield
Posts: 4,725
Re: Plugged trailer in = battery flat

By any chance, is the SMB Radio Power switch on? Could power feed through that and on to other items?

Otherwise, my wiring diagram says the radio fuse (F2.3) only feeds the radio.

Mike
__________________
SOLD04 EB350 Custom Floorplan
6.0 PSD 4.10 Posi
Salem Kroger coil spring 4wd
SMB Trailer w/AT Air Suspension
Alaska to Key West, Labrador and more
130685 miles 16.65 mpg average

Prostate cancer survivor. viewtopic.php?f=8&t=11099
2015 VW GTI
Leaving CA for WA
Ford_6L_E350 is offline   Reply With Quote
Old 10-29-2011, 11:57 PM   #10
Senior Member
 
ANZAC's Avatar
 
Join Date: May 2011
Posts: 1,005
Re: Plugged trailer in = battery flat

Quote:
Originally Posted by Ford_6L_E350
By any chance, is the SMB Radio Power switch on? Could power feed through that and on to other items?

Otherwise, my wiring diagram says the radio fuse (F2.3) only feeds the radio.

Mike
Nope, CB radio is switched to extra battery. Very odd.
__________________

__________________
Sportsmobile-less.

"A job worth doing is worth doing at least twice."
ANZAC is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Powered by vBadvanced CMPS v3.2.3
Disclaimer:

This website is not affiliated with or endorsed by Sportsmobile SIP or any of its affiliates. This is an independent, unofficial site.


All times are GMT -6. The time now is 05:55 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
×