A simple Bike Alarm
After reading a few threads about bikes getting ripped off, I thought I'd
post this up as a possible safe guard.
(every lil bit helps)
Here are some instructions for a simple bike alarm.
This will not stop a determined thief (but a good .45 will) but it will scare
away most of them. (if you aint there to shoot)
The mercury switch for the alarm is glued (silicone) to a piece of plastic or
something that can be moved around for adjustment.
The mercury switch must be installed with the wire connections facing the
direction the bike will be moved (away from side stand position).
As you tilt the bike up (away from side stand), the mercury will move to the
other end of the switch, touching the two wire connections, causing the
alarm to sound.
When the bike is moved to rest position (back onto the side stand), the mercury
moves away from the contacts and breaks the connection, which cuts off the
If you want to have the alarm sound a bit longer, replace the mercury switch
with a shock or spring loaded type switch.
With this kind of switch, vibrations/movement of the bike will cause a spring
loaded contact to move inside the switch, make contact, and will sound the
alarm until the vibrations/movement goes away.
(This might give you a few more seconds alarm)
Here is a quick paint image to help out...
If you wire the alarm to the bike battery, I would suggest using an in-line fuse.
The push/pull, on/off switch cuts the power completely off to the alarm and
needs to be wired in a spot that is easy to get to, but out of sight from thieves.
The push/pull, on/off switch could be substituted for a keyed switch too.
(if you want to keep up wit more keys)
Please move to "How-To" forum.