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Old 07-20-2021, 08:48 AM   #1
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Toad Vehicle - GMC Terrain Battery Drain

We are full timers. We recently got a C class for our traveling after 8 years pulling a fiver. We have a 2017 GMC Terrain for a tow. We are having a problem with running the battery down. We don't travel over about 3 or 4 hours at a time. We remove the ignition logic fuse. Anyone have an idea what could be draining the battery?
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Old 07-20-2021, 08:58 AM   #2
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Not a whole lot of data provided so I'm going to sound like Capt Obvious here, something is on as it's powered up. Maybe.. and just taking a stab at random thoughts here.. you have a brake system plugged in to the 12v plug? Maybe your key position to keep your steering unlocked also powers up electronics in the TOAD? Maybe lights? Or a weak battery? Or a combination of all the above?

To prevent any battery drain for our Jeep, we hooked up a trickle charge lead to the battery while under tow and plugged in to the coach.
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Old 07-20-2021, 09:28 AM   #3
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You can have a charge line added from the RV back to the toad to keep the battery up while traveling.

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Old 07-20-2021, 02:11 PM   #4
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Quote:
Originally Posted by RnT View Post
We are full timers. We recently got a C class for our traveling after 8 years pulling a fiver. We have a 2017 GMC Terrain for a tow. We are having a problem with running the battery down. We don't travel over about 3 or 4 hours at a time. We remove the ignition logic fuse. Anyone have an idea what could be draining the battery?
Which fuse number specifically?

Please see the attached PDF if you're not familiar with it. You do need a good charge line. My 2020 Equinox pulls almost 8 amps out of the car's battery when configured for towing and others with different model years have reported similar current drains. That'll kill the battery in two or three hours if your charge line is not present or not working.

Ray
Attached Files
File Type: pdf Equinox Terrain revised flat towing.pdf (17.9 KB, 4 views)
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Old 07-20-2021, 02:26 PM   #5
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My 2019 Terrain owner's manual says to not tow vehicle either on a dolly or 4 down, only with all four wheels on a trailer. Did it change to this with the 2018 year modal. Mine is an AWD it says on the tail gate.
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Old 07-20-2021, 02:49 PM   #6
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2021 Equinox

What does that apply to. It is the first I have seen anything about pulling the ABS Fuse.
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Old 07-20-2021, 03:04 PM   #7
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What does that apply to. It is the first I have seen anything about pulling the ABS Fuse.
Equinoxes and Terrains PRIOR to the 2018 model year needed a fuse pulled in order to flat tow them. Part of the 2018+ redesign eliminated that requirement.

That revised PDF for 2010-2017 also only applies to the 4-cylinder engines.

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Old 07-20-2021, 03:07 PM   #8
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My 2019 Terrain owner's manual says to not tow vehicle either on a dolly or 4 down, only with all four wheels on a trailer. Did it change to this with the 2018 year modal. Mine is an AWD it says on the tail gate.
Beginning with the 2018 redesign the Terrain received an electronic shifter for the transmission; the Equinox did not. That's why the 2018+ Terrain can no longer be towed four down while the 2018+ Equinox can still be towed four down.

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Old 07-20-2021, 06:33 PM   #9
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There is a easy way to fix this. Remove the logic fuse as you are doing. let the car idle while connecting to the coach. Shift the transmission into neutral. Turn the key to OFF, DO NOT REMOVE THE KEY. The steering will remain unlocked as long as the key is NOT removed, and there is NO electrical load with the key in the OFF position. If you are using a auxiliary brake system such as the RVi3 or such that require 12 volts, there is a power port in the rear cargo compartment by the hatch that is powered at all times. Simply rig an extension port to your braking system using 12ga wire. These braking systems do not use enough voltage to run the battery down especially on a 4 hour or less trip. If it does have your battery tested because it is going bad.
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Old 07-20-2021, 07:32 PM   #10
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There is a easy way to fix this.
While that may work for your V6, we do not know if the OP has the standard 4-cylinder or the optional 6-cylinder. The PDF I attached is the procedure to stop a possible "death wobble" due to the 4-cylinder having electric steering.

Me? I'd put in or fix the charge line, follow the manufacturer's directions, and be done with it.

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Old 07-21-2021, 01:14 PM   #11
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While that may work for your V6, we do not know if the OP has the standard 4-cylinder or the optional 6-cylinder. The PDF I attached is the procedure to stop a possible "death wobble" due to the 4-cylinder having electric steering.

Me? I'd put in or fix the charge line, follow the manufacturer's directions, and be done with it.

Ray

My towing procedure will work for either a 4cyl electric steering or 6cyl hydraulic steering. All that TSB does in reality is kill power to the control ECM for the electric steering sensor which is active even when the key is in the ACC position. With my procedure there is no power to any of the control systems with the key in the off position.
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Old 07-22-2021, 08:14 AM   #12
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Have a 2015 Equinox (Chev version of Terrain). Originally pulled the Discrete Logic Circuit (dlc) fuse, and on rare occasions got a slow speed death wobble. New arrangement per GM is to pull ABS fuse, leave dlc fuse in, and add a charge line. Did that and battery deader than a doornail after 400 miles, even though getting 14V (with a charged batt) when coach running to charge car. Pulled dlc fuse and battery charged, but did get death wobble when I hit my 'favorite bump' while making a turn. So, one question is 'what does pulling the ABS fuse have to do with the death wobble'? Now at this point in time I have to decide if I'm more concerned about a somewhat rare slow speed death wobble during a turn if a bump is encountered, or a guaranteed dead battery at the end of each day. Think I know my personal answer
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Old 07-22-2021, 10:59 AM   #13
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Try this, Pull or turn off via a switch the #32 fuse. start car and shift into neutral. Turn ignition key to OFF, DO NOT REMOVE THE KEY. As long as the key remains in the ignition in the OFF position the steering will remain unlocked. This method does not power the ABS control sensor which causes "bump steer" wobble as described in the GM TSB and cuts off any voltage drain on the battery. Try this method and see if it corrects both of your problems.


If you should experience continued wobble, caused by loose steering tolerances, you can take a couple of long bungee cords and hook one end to the driver's seat bottom frame and loop around the bottom of the steering wheel a couple of times and back to the seat frame with the other end. This will provide a centering force to counteract the wobble while towing.
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