View Full Version : 12v socket adapter

29-04-2010, 08:55 PM
Made this 12v socket adapter for my 2007 Fatboy, here's how if you want a go yourself, cost about £11 for all the bits.

Tools required
wire snips, 'long nose' pliers, small flat blade screw driver (watchmaker), soldering iron and solder, marker pen, ruler.

Parts (with Maplin part number)

'Figure 8' wire 10 amp (W036), Lighter socket (G034), Kyosho connector (G042), Inline fuse holder (0961), Glass fuse 10 amp (1018), Heat shrink tubing (optional).

remove about 5mm of insulation from both ends of the wire and cut a section from the middle of the red line about 32mm long. With a little care you can snip just the red line and separate it from the black line. Remove about 5mm of insulation from the ends you've just created in the red line. 'Tin' the ends of the wire with a little solder.


Take the fuse holder apart and place one end over a centre section of the red line, position the contact feral on the wire and tighten the grub screw. Repeat for the other side of the centre section, note the spring goes on first. Insert a new fuse and re-assemble the holder.

If you're a bit fussy like me you can use a piece of heat shrink tubing to stop the wire from separating, remember to leave enough room to slide the fuse holder apart should you need to replace the fuse.

Take the lighter socket apart and gently push the inner sleeve out about 5mm or so, this is to stop the outer case melting when you solder. Place the cap over one end of the wire and pull through so you have enough room to solder. You'll notice two solder tabs, one on the inner sleeve and one on the centre pin. Solder the red line to the centre tab, black line to the outer tab. Make the black line 'lean' inwards otherwise it's difficult to re-assemble. Check your connections and re-assemble.


Place a small piece of heat shrink tubing over the other end of the wire. Crimp the two connecter pins on. Now, you're supposed to do this with a proper crimping tool but most of us don't have one. You can do a reasonable job with 'long-nose' pliers and to make sure I've also soldered them but not to much otherwise you'll fill the hollow pin with solder.

Check the orientation of the 12v socket on your bike. On mine, looking at the connecter with the latch clip up, the +12v (red) is on the left and 0v (black) on the right. Align the plug with the two connecter pins to match the socket and slide them in. There is a small barb on the pins which locks them in, they are non-releasable so make sure you have the correct orientation.

Finally, if you've used heat shrink tubing apply some heat and shrink in place.

Before you go plugging everything into the adaptor check the polarity first. I made this for my phone charger that needs +12v on the centre pin and 0v on the outer part of the lighter socket, so a check with a volt meter confirmed I have the correct connection.

30-04-2010, 12:03 AM
Steve, have you not seen these? £8 :redface:. Obviously you do need to have an optimate, but it seems most people do and at our nearest H-D stealers, every bike comes already fitted with the attachment that this plugs straight into.

http://i.ebayimg.com/01/!Bn+D)yQ!Wk~$(KGrHqQOKjwEt8nE9T(CBLlsP0vtiQ~~_35.J PG

30-04-2010, 07:19 AM
yep, seen them but my local stealer wanted £17 for it :frown:

karl von fatboy
30-04-2010, 07:44 AM
Lidl is currently selling an inverter for £14.99.
So from optimate connector to 13A. Ideal for your hairdryer:D


30-04-2010, 10:43 AM
yep, seen them but my local stealer wanted £17 for it :frown:

Well they would, lol. Ebay everytime. £8 or even direct from Optimate, bit more than £8 off them I think, but all the work done of course.

30-04-2010, 10:49 AM
I've done both methods - make one and then found optimate do them (DOH!) - about £11 I think (local stealer is taking the p1ss - big shocl there then!) - was more expensive to buy the bits really!