Double batterys - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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Where does this wire go?
Includes Electrical mods, Lights, Stator,
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post #1 of 15 (permalink) Old 06-16-2017, 10:20 PM Thread Starter
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Double batterys

question . I have two Vulcan 750 a 1995 and a 1989. I would like to know would it be safe to install a second battery wired in parallel so I would double my ability to provide a stronger power to my starter or is it an issue to put to much additional strain on our bikes stators by doing this . With recent manufacture of iron phosphate batteries that are small and can easily be placed in saddle bags. Is this a doable solution for the poor electrical problem our bikes have or is it a bad move.

My bikes both start well but its the hot restart that gives me issues . When the bike is hot its hard to restart some times . Would appreciate some thoughts on my idea

!995 1989 VN750 Both bikes have identical accessories. Rear facing cameras with windshield mounted color monitors. Hard saddle bags. Tire pressure monitors. All recommended mods. Removable rear trunks with alarms. Ground facing LED Kawasaki logo illuminate with brake lights .
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post #2 of 15 (permalink) Old 06-16-2017, 11:17 PM
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post #3 of 15 (permalink) Old 06-16-2017, 11:22 PM Thread Starter
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One bike is agm the other bike is a shorai lithium iron phosphate, I just want to try and increase my power to start

!995 1989 VN750 Both bikes have identical accessories. Rear facing cameras with windshield mounted color monitors. Hard saddle bags. Tire pressure monitors. All recommended mods. Removable rear trunks with alarms. Ground facing LED Kawasaki logo illuminate with brake lights .
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post #4 of 15 (permalink) Old 06-17-2017, 09:20 AM
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Check out the pickup coil mod; seems to fix it. I'm getting ready to do it to my bike this weekend.
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post #5 of 15 (permalink) Old 06-17-2017, 10:16 AM
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With a ago already, pickup coil mod should take care of it

2005 VN750

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post #6 of 15 (permalink) Old 06-17-2017, 12:41 PM
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To answer your question.... You can run two batteries in your bike, but I'd advise against it. The other battery would put a strain on your charging system. They do make "battery isolators" that would prevent this, but unless you are running A LOT of other electrical accessories, I see no need.
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post #7 of 15 (permalink) Old 06-17-2017, 12:43 PM
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Bad move.

If you are having trouble starting, address the issue, don't just band-aid it with trying to parallel up some batteries.

I third the pickup coil mod. Direct power to the coils did a ton of good.
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1986 Kawasaki Vulcan 750
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post #8 of 15 (permalink) Old 06-17-2017, 04:18 PM
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Not a good idea to parallel batteries as each one will charge and discharge differently. Whichever is the most easily charged will be constantly overcharged and vice versa.

'99 Vulcan "Victoria"
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post #9 of 15 (permalink) Old 06-17-2017, 06:04 PM
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Quote:
Originally Posted by TonyO View Post
Not a good idea to parallel batteries as each one will charge and discharge differently. Whichever is the most easily charged will be constantly overcharged and vice versa.
That's why I said you'd need a battery isolator....to prevent this exact thing.
I'm not sure even then if this would help. You'd need to rewire the bike so one. Battery only is used to start the bike, and the other powers all the lights and accessories. A lot of work for something you really don't need on a bike like the Vulcan. A Goldwing with a big stereo, heated seats, etc...be a good candidate... but you'd also have to make sure the charging system could handle the extra load. I think Harley Police bikes had two batteries.....

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post #10 of 15 (permalink) Old 06-18-2017, 08:22 AM Thread Starter
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I see all of your points. Well taken I guess I will try the coil mod. Thanks to all

!995 1989 VN750 Both bikes have identical accessories. Rear facing cameras with windshield mounted color monitors. Hard saddle bags. Tire pressure monitors. All recommended mods. Removable rear trunks with alarms. Ground facing LED Kawasaki logo illuminate with brake lights .
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