Installing An
Accessory Power Outlet
On A
Suzuki GS500E

There must be dozens of ways to rig up an accessory power outlet on your bike.  These pictures show my first attempt.  There are a few things I wish I had done differently, but on the whole I'm satisfied.

Click on a picture to see a larger version.

The obvious thing to get first is the accessory power outlet you want to use.  I bought this one at Radio Shack for about $8.   It has an On/Off switch and a built-in fuse.  Unfortunately, these cool features are incorporated into the half that you don't use....

Before you buy your quick connect terminals, you may want to decide how long you want the adaptor cord to be and cut it.  Then you can take the adaptor to the hardware store and compare it with wires of known gauges. You need to know the right size so you can buy...

...matching quick connect terminals.  I spent a little extra and got the kind that fully enclose the connection.

While you're buying, pick up an inline fuse. You're going to hook the adaptor directly to the battery, so you want to protect the equipment that you plug into it and also protect against shorting.  Install on the positive wire.  I found this one in my toolbox.  I must have bought it at an auto parts store somewhere along the line.  They are also available at Radio Shack.

One last part to buy.  I wanted to use wire with red insulation for the positive battery terminal connection, and one with black insulation for the ground connection.  I bought the red wire by the foot from a spool at the hardware store.  I think I got 18 gauge wire.   I also made sure to get quick connect terminals to fit this wire size.

You pretty much need to look at the larger image to see the wire I'm talking about.   Sorry I didn't take a separate picture before installing it....

Here is how I connected the red wire to the battery.  I threaded it through the "hood" that protects the positive terminal from accidental short circuits.  Then I secured it with the same bolt that holds the battery cable in place.

The black wire needs to be connected to the negative terminal of the battery.  Since the bike has a "negative ground", just about every piece of metal on the bike is connected to the negative terminal via the frame.  So I decided to use the strip of metal that the seat lock release is mounted on.

After scraping a tiny spot of paint away I tested for 12 volts with a voltmeter. The test was successful, so I got out my tap and die set and made a threaded hole to match a small bolt that I had laying around.

If you don't have a tap and die set you can just drill a regular hole and use a nut on the underside.  I went this route because I wanted to make sure I had a good electrical connection to the metal.

OK. Before you hook everything up you need to put some thought into how you're going to keep the connections straight.  In my case all of the quick connect terminals were the same color, but I needed to make sure I could always hook up positive to positive and negative to negative.

For this “first attempt” I cut the ends of the adaptor wires at different lengths.  I could also have used some red nail polish or something to indicate the positive wire.

I thought about using a male connector on one end and a female connector on the other, but I decided against it.  The wires that go to the battery would have needed the same mix of connectors, and I didn't want someone to accidentally fit them together and blow the fuse.

Speaking of positive and negative connectors, you need to know which is which!  This is a direct current (DC) contraption you're assembling here, and the + and - stuff matters!  If you hook it up wrong, you may have to kiss your charger/phone/other device goodbye....

I took my voltmeter out to the car and tested its cigarette lighter to see whether the “can” or the “contact point” at the bottom was positive.  Then I used the meter to find out which wire was connected to the matching part on the adaptor.

Once I knew which wire was which, I used a zip tie to bind the red and black wires tightly together.  In my case, the positive wire on the adaptor was shorter than the negative wire, so I made the positive wire to the battery stick out more than the ground wire. ( Here you can finally see how I mounted the black wire....)

Time to connect it all up.  Tweak the wire lengths if you need to, so there's no undue strain on the connections.

One more deep breath... OK, maybe one more...  Now plug in your precious electronic device and hope for the best.


This is kinda how I envision using the adaptor “on the road”.  Of course everything should be tucked away in the saddlebags--out of the wind--but what kind of a photo would that make?

This is another one that needs to be viewed in the larger format.  Sorry folks--I'll try to do this in the daylight next time....

One final touch.  I attached a leftover quick connect terminal under the seat to cap the positive wire when it's not in use.  Anything to avoid an accidental short circuit!  You could install two of them if you wanted to keep water and dirt away from both wires....

Do you like the “safety wire”? I pulled it out of a discarded telephone cable.

What do I wish I had done differently?

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