Battery Tender cable - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 15 (permalink) Old 08-13-2019, 05:11 PM Thread Starter
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Battery Tender cable

Okay new here, Bought the FJR last September installed new battery. Now I have battery tender pigtails installed. I want to carry a power pack for the long trips. Just in case... Former boy scout here. But not sure if I can run a power pack thru the battery tender cables. Main concern is will I fry the pig tails or the battery. Any help would be greatly appreciated.
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post #2 of 15 (permalink) Old 08-13-2019, 05:28 PM
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Battery Tender cable

Quote:
Originally Posted by lhsesq View Post
Okay new here, Bought the FJR last September installed new battery. Now I have battery tender pigtails installed. I want to carry a power pack for the long trips. Just in case... Former boy scout here. But not sure if I can run a power pack thru the battery tender cables. Main concern is will I fry the pig tails or the battery. Any help would be greatly appreciated.
lhsesq,

There should be an in-line fuse in the battery tender pigtail line. The manufacturer of the battery tender can advise you, if there is not. Do not replace it with a heavier fuse, and your wires should be okay.

There is nothing to say that you should connect the power pack and immediately try to start the engine. Give things a minute or two to equalize first, with everything turned off. Then the battery and the power pack will be both working together, not just the power pack alone. If you rush things, you may blow the in-line fuse, so have spare fuses of the correct value.
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post #3 of 15 (permalink) Old 08-13-2019, 05:38 PM
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I don't think that's a good idea. The times I used a jumper pack I hooked directly to the battery with the clamps that came with it for the purpose. A battery tender lead isn't sized or rated for starter current.
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post #4 of 15 (permalink) Old 08-13-2019, 05:49 PM
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If by powerpack you are talking about the Lipo jump starter, yes and no...

Wire gauge dictates how much current can flow. for 1/2 amp 12volt the #12 or more likely #14 gauge wire of the battery tender pig tails is OK for that low amperage trickle charge.

But to connect a car battery to it and hit the starter... you would melt the insulation.
To connect the powerpack and hit the starter, same... BUT

But you could probably connect the powerpack and then energize it to transfer energy to the ship's battery and the disconnect before engaging the starter.

I have the battery tender pigtail connected. Under the seat you will find I have a battery tender extension cord AND the batter tender clamps. If I find i have a dead battery, I will connect all that up and hook to a running car TO CHARGE my cycle battery, to attempt a start.
**NOTE if you do this, you will have reverse polarity on the clamp COLORS so connect RED clamp to car's ground and BLACK to car's positive battery terminal... (connect black first to car's positive and tap red to ground to make sure it is little spark)(Big spark and it is backwards) Disconnect something and try to start from cycle battery.

If its got teats or tires, your bound to have trouble with it...
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post #5 of 15 (permalink) Old 08-13-2019, 05:52 PM
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btw, Welcome to the FJRowners forum!

If its got teats or tires, your bound to have trouble with it...
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post #6 of 15 (permalink) Old 08-13-2019, 05:55 PM Thread Starter
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The inline fuse for the tender is 7.5 amp. So yeah most likely right about blowing it. First bike I ever had with fairings really didn't feel like pulling them off to jump the bike... Guess its clamps then. Or bump starting in times of trouble. Haven't done that in years lol thanks for the help
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post #7 of 15 (permalink) Old 08-13-2019, 05:56 PM Thread Starter
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Thanks being ghosting it for awhile.. Great stuff and good tech. Plus no attitudes. Nice to see.
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post #8 of 15 (permalink) Old 08-13-2019, 06:08 PM
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That battery tender wire is like 16 ga. Biggest fuse you can put in there is a 30 amper, and it will blow immediately if you attempt to jump start that way. Starter draw is way big. Best you run a 10 ga pair of wires to the rear under the seat for convenience and jump it there. Put a 50 amp connector on there and get another one to make an extension (or in my case, booster cables). My 10. ga. also feeds my aux. fuse panel.
Here's what I have, but I haven't used it to jump my bike, always somebody else. Battery Tender lead is for charging the battery or for using my air compressor.
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File Type: jpg P1020776 (Large).JPG (358.5 KB, 29 views)

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post #9 of 15 (permalink) Old 08-13-2019, 06:20 PM Thread Starter
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Thanks for the info and picture. Kind of looks like my brother in laws hybrid under there.
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post #10 of 15 (permalink) Old 08-13-2019, 07:11 PM
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Quote:
Originally Posted by lhsesq View Post
The inline fuse for the tender is 7.5 amp. So yeah most likely right about blowing it. First bike I ever had with fairings really didn't feel like pulling them off to jump the bike... Guess its clamps then. Or bump starting in times of trouble. Haven't done that in years lol thanks for the help
If the battery is that flat, trying to bump start the FJR will not do anything but make you tired and sweaty.

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