The Frugal Yankee PDB

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Fred W

1 Wheel Drive
FJR Supporter
Joined
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Location
Eastern VT
So, here is the scenario...

My trusty pillion (TMJ) and I are due to celebrate another rotation around the sun together pretty soon. It'll be 34 times since our nuptials come December 11th, to be precise. Anyway, she is a somewhat diminutive person (4'12" and only ~105 lbs soaking wet) so she does get chilled rather easily while on on the back of the bike, especially when the mercury starts to dip. She has been longing for some heated gear to stave off the onset of hypothermia. Well, if she is willing to ride around on the back of a murdercycle with me, who am I to argue?

I recently bought her a Warm'nSafe full jacket liner and their dual portable temp controller (I'll eventually get her either gloves or pants liners too) as an early Anni gift. This morning I decided to do something about wiring up the necessary power for her new jacket liner.

Up until now, I have made do with a single switched power terminal strip up in the nose section. It powers the heattroller for the heated grips and gloves (using a Y harness to the gloves) and provides a switched power source for the Datel Panel Meter. The rest of my electronica (intercom, GPS, radar detector) is powered out of my tank bag, which plugs into a single "always hot" Powerlet jack in the "D" panel. I just unplug the tank bag whenever I get off the bike.

To power heated liners would require a power source further back in the bike, like underneath the seat. I decided that I could have this power source be "always hot" as we would be unplugging the heated gear any time we were getting off the bike anyways. I have an extra BlueSea fuse panel on the shelf, but I just do not have enough room under my seats for it. I could have bought a Fuzeblock (I actually have one on the V-strom) but I don't think really need anything that fancy for just powering heated gear.

Instead, I picked up a few bits and pieces at Radio Shack and fabricated my own little power distribution box.

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Here's what I bought:

One small plastic project box (3"x2"x1")

One in line mini-blade fuse holder

One euro style terminal strip (cut in half)

Some supplies that already had on hand and used:

One 10-12 gauge heat shrink type ring lug

One 10-12 gauge heat shrink type butt splice

A bunch of red 12 gauge wire

A short piece of 16 gauge black wire

I like these euro style terminal strips as you don't have to crimp ring lugs on the ends of the wires. You just strip, twist, and jam them in, then tighten up the set screws. I used the 16 gauge wire to make 5 short jumper wires, and then daisy chained all of one side of the euro style terminal strip together.

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The project box is just to keep the 12V strip from shorting out against anything under the seat. It really doesn't need to be water tight. The terminal strip fits neatly inside the box. (stub of 12 gauge wire just for test fitting) I'll only be using a single output lead for now, but will have 4 more terminals to add more output cables in the future. Maybe I'll get myself a heated liner someday...

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I used a Dremel rotary tool to remove the lip on one edge of the project box's top and then to cut appropriate sized notches in the deeper section of the box for the wire entry.

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I spliced the Rat Shack in-line fuse holder to a long section of my red 12 gauge wire, and put the ring lug on the other end of the fuse holder, and inserted a 30amp fuse in it. Installed that onto the positive battery terminal (after disconnecting the negative terminal of course) and ran the wire up along the left side of the bike, inserting the wire into the split loom previously installed for my AVCC, up to the area of the tool tray underneath the seat. Leaving enough slack for serviceability I cut the 12 gauge run to length, stripped it back and installed it in place of the stub in the strip. Here's the new box located neatly in the tool tray.

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I'd already used up more than half of the tool tray with my AVCC servo, and underneath the new PDB is another identical project box with my HID headlight time delay circuit in it.

Naturally, I've had to relocate my tools further back underneath the passenger seat. And here you can see the location I used to pick up a frame ground (latch bolt/nut) and the new power cord that I'll run out from under the seat to hook up to TMJ's new heated liner when she wants to use it.

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Almost forgot. Total cash outlay (today) for this project was less than $6. Probably less than $10 total including the supplies I already had.

 
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It's the button that makes the machine go "bing!"




PS - surprised that you didn't zero in on the "daisy chain" phrase... :huh:

:p

 
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It's the button that makes the machine go "bing!"
Hey, I've got a little button under my seat too. It's a delicate little thing engineered in Germany and manufactured by Swiss watchmakers. It makes a oh so satisfying little 'tink' noise when you push it. I asked the previous owner what it's for. "He said, never EVER push that button"

Being the curious sort, I just couldn't resist. <tink>, nothing.

I walked back into the house only to see a breaking news story on CNN that Mount Etna erupted!

 
Ejector seat? No.

Self destruct button? No.

Switches on the interior lights when the seat is removed? No.

Some sort of circuit breaker? Maybe....

 
Thanks!!

One thing that I failed to mention is that with this PDB idea you have to make sure that each load that you hook up to the terminal strip has an appropriately sized in-line fuse on it. The harness for the heated gear is made for directly hooking to a battery and so has an in-line fuse in it. You can actually see it in the picture of the installed box.

 
While discussions of daisy chains could very well be more interesting, I do have a question on the OP's PDB. This pic looks to me like you have shorted all of the connections on the right side together (assuming this is a ground?) yet installed a (+) and (-) on the left side and say you have room for 4 more circuits. How is this terminal strip built? You'll have a hot and a ground both for every circuit you add, how will 4 more circuits fit?

Once this gets answered, daisy chain discussions can be restarted.

Thanks

 
While discussions of daisy chains could very well be more interesting, I do have a question on the OP's PDB. This pic looks to me like you have shorted all of the connections on the right side together (assuming this is a ground?) yet installed a (+) and (-) on the left side and say you have room for 4 more circuits. How is this terminal strip built? You'll have a hot and a ground both for every circuit you add, how will 4 more circuits fit?

Once this gets answered, daisy chain discussions can be restarted.

Thanks

Hey Drew,

The wire colors shown in that picture were an unfortunate coincidence. The heavy gauge red wire is the + feed from the battery. The black wire is the + lead going off to one of the heated vest pig tails. There is no provision in that PDB for a negative bus. Because I am only using this for heated gear, there is no real need to run a ground cable back to the battery. As I showed in the original post, I am just bolting the ground cables from the pig tails to frame ground.

However... If you also wanted to use this PDB for some electronic gear, and were therefore concerned about ground noise, you could easily split the terminal strip into two buses (one positive and one negative as you inferred) just by leaving out the center jumper wire and then just run another heavy 12 gauge (black?) wire back to the battery negative terminal. And you would then only be able to power two circuits.

PS - I'll bet that Wheaton's wife already knows more about Daisey Chains than she is letting on... :p

 
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