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Old 03-01-2003, 12:37 PM   #1
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Lightbulb 3rd battery for less than 10 bucks

hey gang,

here is my latest project.

i have a 2500 silverado 4x4 with the "snow plow prep package" it has a 2nd battery with a relay installed from the factory.

i decided to put it to use finally, to have more reserve battery power when boondocking.

the materials from ace hardware, less than ten bucks.
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Old 03-01-2003, 12:39 PM   #2
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under the hood...

this is the placement of the batteries
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Old 03-01-2003, 12:40 PM   #3
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relay

and this is the relay
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Old 03-01-2003, 12:41 PM   #4
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wire

running 10 ga wire
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Old 03-01-2003, 12:44 PM   #5
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fuse box terminations

this is a pic of the fuse box termination and the no longer needed 30 amp fuse.

the aux battery is fused with a 40 mega fuse.
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Old 03-01-2003, 12:46 PM   #6
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install complete

new wire terminated, old fuse removed
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Old 03-01-2003, 12:48 PM   #7
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Cool bam! done!

testing brakes and interior lights with no batteries installed in the trailer.

john
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Old 03-02-2003, 09:29 PM   #8
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Thumbs up Nice Job!!

John,

Nice job!! Are you going to put in a deep cycle after this one dies of old age?

John
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Old 03-02-2003, 09:43 PM   #9
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Lightbulb

John HD-A little off the subject, but what is that thingy on your electric jack? I might need one for my Airstream.
I have a Duramax with 2 batteries and am going to see if mine has that relay also. Great idea!
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Old 03-03-2003, 12:59 AM   #10
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Question

john

hadn't thought about that, i have "regular marine" batterys in the trailer. i'll probally replace it with one like that with the exception of needing a side terminal design. all four are 650 cca.

raptorider,

the thingy is my flag pole bracket.

a second battery on a duramax is most likely used for the glow plugs and starting. unlike mine.

you could add a battery isolator, but i don't think it would help in your case because your batteries are wired in parallel to the starter.

a duramax would by design, already supply current to the 2nd post in the fuse box by both batteries.

john
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Old 03-03-2003, 07:37 AM   #11
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I did roughly the same thing....

I just came off the + post of the 2nd battery and ran it through a small 30 amp breaker, then out the existing wiring harness to the trailer receptacle. Mine also has the isolation relay. On thing I am wondering, if one were to run both the trailer battery and truck aux battery down, what would the draw be on the main truck battery when attempting to start the truck. That relay energizes when the ignition is on, to facilitate charging the 2nd battery. I would guess that 40+ feet of #10 would limit the current. Has anyone calculated the voltage drop?

John, better get that rear license plate taken care of before the cops see it!
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Old 03-03-2003, 07:52 AM   #12
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Thingy on jack

Quote:
John HD-A little off the subject, but what is that thingy on your electric jack? I might need one for my Airstream.
That is a flag holder. A previous owner was undoubtedly an officer in WBCCI; probably a Past President. The 3 flags displayed are US, Region or Unit, and Officer's flag.
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Old 03-03-2003, 07:58 AM   #13
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resistance

pick

if the second battery was run down and you turned the key on the good battery would start to charge it. kinda like jumpstarting a dead battery. but when you turn the key to start the resistance of the battery would be much more than that of the starter. this would mean that most, if not almost all of the current from the good battery would go to the starter.

i'll have to try it and see!

as for the resistance of 40 feet of #10, i'll have to look that up.

i'll get my plate fixed asap! don't want to get hassled by the man!

john
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Old 06-02-2004, 01:02 PM   #14
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Hey JohnHD it has been a year since this thread. How did it all work out? Any updates or problems encountered ?
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