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Dead battery and check engine light

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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

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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. 

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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.

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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.

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gemarsh 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.

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gemarsh 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

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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

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gemarsh 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.

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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.

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