Jump to content

Dead battery and check engine light

2020gmc
 Share

Recommended Posts

Jay P Enthusiast

Jay P

Posted
Posted
2 hours ago, Steve Martin said:

Looking for details on this.  I've got a good idea, just curious your setup details if you can share.

Got one of these. Bought some wire at Home Depot (2 wires in one cable). Hooked up the + & ground. My battery maintainer came with an adapter meant for a motorcycle battery which I soldered on to the 2 wires. Just plug it in and let in charge/maintain the battery.

I work from home so I don't drive much anymore. I can go 3 to 4 weeks without doing anything and my truck will still start fine but that can't be good for the battery. All the computers the truck has drain the battery even though they go to sleep after a short time.

 

Jay

 

https://www.amazon.com/POLLAK-12-706-Plastic-Blade-Style/dp/B000BGOFCC/ref=sr_1_omk_6?crid=F4B0G3WWYSDM&keywords=7+pin+trailer+plug&qid=1648997643&sprefix=7+pin%2Caps%2C174&sr=8-6

  • Replies 83
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

Tomato
Tomato

Thanks for the fix!  Tripped both P0700 and U0100 today and found this.  Those 4 bolts were only at about 15 inch-pounds, and the green indicators were up.  Talked to my service rep at the dealer to c

2020gmc
2020gmc

Lol! Thanks. Must admit this is my first gm product and it takes the prize for spending some time in service so soon. Got my truck back! They put a new battery and cleared codes. Plus they took care o

Colossus
Colossus

Well she'll not be too troublesome from here on out.  Chances are, she sat for quite a bit after being built and the battery went bad. 

Posted Images

Steve Martin Enthusiast

Steve Martin

Posted
Posted

Jay,  Thanks.  That's what I was thinking mainly.  My only concern is feeding amps backwards through the wiring to the battery through whatever harnesses and wiring are in the loop back to the battery.  It's not a direct battery connection obviously like you would hook up a charger/maintainer to.

Jay P Enthusiast

Jay P

Posted
Posted
2 hours ago, Steve Martin said:

Jay,  Thanks.  That's what I was thinking mainly.  My only concern is feeding amps backwards through the wiring to the battery through whatever harnesses and wiring are in the loop back to the battery.  It's not a direct battery connection obviously like you would hook up a charger/maintainer to.

True but that connection is there to charge/maintain an RV battery (it can also provide power for electric brakes) so it has to be direct and the wire sized properly to do that.

gemarsh Senior Enthusiast

gemarsh

Posted
Posted
15 hours ago, Jay P said:

True but that connection is there to charge/maintain an RV battery (it can also provide power for electric brakes) so it has to be direct and the wire sized properly to do that.

Good idea! I didn't think the 7-way would have power back there when truck is off. Never thought of taking a dvm or a simple test light to check.

 

My '21 1/2ton and '22 1ton both have 30 amp fuses. Still, it's plenty big for a battery maintainer.

gemarsh Senior Enthusiast

gemarsh

Posted
Posted
15 hours ago, Jay P said:

True but that connection is there to charge/maintain an RV battery (it can also provide power for electric brakes) so it has to be direct and the wire sized properly to do that.

How do you remember to unplug the connector before driving? 

 

I would backover the maintainer, destroying the maintainer, shorting out the fuse and be cruising down the road with a cord dangling behind me like a honeymoon procession car!

 

pumphandle.jpg.2a326ff99c69b089679d5ef25828d943.jpg

Steve Martin Enthusiast

Steve Martin

Posted
Posted
On 4/5/2022 at 9:26 AM, gemarsh said:

Good idea! I didn't think the 7-way would have power back there when truck is off. Never thought of taking a dvm or a simple test light to check.

 

My '21 1/2ton and '22 1ton both have 30 amp fuses. Still, it's plenty big for a battery maintainer.

so on the 7 way 1 o'clock is pos and 7 o'clock is neg.  I get 12.65 volts touching the two with a multimeter.  I'm thinking this might do the trick or what Jay previously posted will work as well.  I'm trying to understand what this is actually used for in real life.  Why would you need to hook up an inverter to the 7 way on the truck?  I'm sure there is a purpose.

Hopkins adapter.png

gemarsh Senior Enthusiast

gemarsh

Posted
Posted
2 hours ago, Steve Martin said:

so on the 7 way 1 o'clock is pos and 7 o'clock is neg.  I get 12.65 volts touching the two with a multimeter.  I'm thinking this might do the trick or what Jay previously posted will work as well.  I'm trying to understand what this is actually used for in real life.  Why would you need to hook up an inverter to the 7 way on the truck?  I'm sure there is a purpose.

Hopkins adapter.png

I'm under the impression Jay is using this idea to keep his battery fully charged with a small battery maintainer, without having to pop his hood to hook the maintainer up.

Steve Martin Enthusiast

Steve Martin

Posted
Posted
12 minutes ago, gemarsh said:

I'm under the impression Jay is using this idea to keep his battery fully charged with a small battery maintainer, without having to pop his hood to hook the maintainer up.

Yes.  I think I'll buy maybe one of these and rig it like he did with my maintainer.  I was just thinking about why this plug is for an inverter which I do have but after thinking about it further I can see where it would be somewhat handy if you don't use the plug in the truck bed.  Except for camping you'd have to be careful to keep the battery charged or be stuck in the middle of nowhere unless you have a jumper of course.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • Grumpy Bear
      AFM Experience

      By Grumpy Bear · Posted

      Question @diyer2 on this line if you please. Are you saying the shudder is the system turning on and off at the frequency of the shudder? Guess I'm asking if you are saying you have seen it do this with the bi-direction scan tool in graph mode? If so have you been able to discern the 'trigger'. Something is telling to cycle rapidly.    My truck just started doing this recently. 197K on the clock. My response has been M5 anything under 55 mph. I treat it like a lugging stick shift. Gear down and let it spin a bit. Engauge M5, then tow mode and then M6 lets the trans stay in 5th but the AFM is active. Smooth like Skippy.    My thought was that as a machine ages the friction gets lower and as the system is load based, the lower friction would allow it to turn on at ever lower rpm until it reaches the lugging point. And yes I am ignorant of any minimum rpm requirement for the system. If you know that would be useful information.    As you know I run a Scan-Gauge II which allows me to watch the On/Off of the signal to the VLOM. While in the shudder mode I'm not seeing is cycle at that frequency or at all for that matter outside the triggers @newdude posted a few years back. Now is it possible that the refresh rate isn't fast enough to catch it? Maybe. It is why I asked my first question about graphing and trigging parameter.     As we have observed from members here the failure point is all over the map miles wise as you note yourself in your opening post. That by itself begs a few questions like fellows that comment on these lifters failing even after the system has been disabled. Long after. 😬   https://www.enginelabs.com/news/tech-tips-replacing-ls-active-fuel-management-lifters-with-melling/   The Gen5 lifters operate the same as the LS versions. In fact they are the same lifter.    https://www.enginelabs.com/tech-stories/sorting-out-gen-v-lt-lifter-failure-with-a-simple-valvetrain-fix/        
    • SwitchBladeSierra
      14-18 Sierra 1500 Heated Steering Wheel Help

      By SwitchBladeSierra · Posted

      UPDATE 2: Steering wheel control backlights and control of the cluster can supposedly be achieved by adding a wire to pin 20 of the cluster and tapping it to pin 2 of the main clock spring harness. I'm going to give it a shot - will update  
    • newdude
      Seems to be Missing a lot of Updates

      By newdude · Posted

      GM Global A pickups 2019-2022 can do OTA programming for the radio.  GM VIP (GM Global B) can do OTAs for almost every module on board.  So a 2022.5 and newer pickup can do OTAs for recalls like the 2.7 fuel flow recall.  EVs get OTAs that improve one pedal driving, radio issues, HVAC issues, updated battery management software, etc.     So age of the vehicle/what GM electrical platform its on will alter what amount of updates can be pushed on OTAs.  
    • Blade8971
      Upgrade to a 2026 AT4 with the 3.0L Duramax

      By Blade8971 · Posted

      Thank You.   So far my new ride is making me look like a genius for going with the 3.0L, as my first fuel refill occurred over three weeks from when I took delivery.  This engine combination is very amazing.  So far no issues and had not done a regen yet.
    • Chuck FB
      Correct way to service 2024 l8t allison trans?

      By Chuck FB · Posted

      I am curious as to how much fluid you put back in the transmission ( assuming you had replaced the filter to compare to my findings ) and then went through the process of warming up the trans before pulling the check plug to drain out the excess and if you measured how much came back out.    I just found it surprising that some claimed a certain amount less fluid being put in and then draining some back out. The attitude of the truck as per if the surface is level and how the trucks stance is would make quite a difference since the check plug is right at the front of the transmission. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...