ok for futuren referance this is what has been suggested from a motorcycle forum i am a member of
Do the following measurements - this will show which circuit has the problem:
1. Disconnect battery and measure voltage across terminals - note down voltage
2. Remove all fuses from your fuse panel
3. Reconnect your battery and measure again - note down voltage
4. Replace one fuse only at a time - note down voltage each time with reference to each fuse replaced, and then remove it for the next fuse ..
You likely have a short somewhere in your wiring...or your battery is screwed..
When there is a drop in voltage - you should note what fused circuit is doing it....like lights, heater, radio whatever
positive probe to positive terminal (red) black to negative terminal.
putting multimeter across a fuse will only measure if voltage is present - or not. - does not matter which way you connect here
just adding to what CX PHREAK has already said
Even better,
If your multimeter has an AMP or A setting, remove a battery terminal and connect the leads of the multimeter between the battery and the battery terminal you removed (connect the multimeter in series). This will measure the current (AMP's) being drawn from the battery.
You should always set your multimeter at the highest setting in the range you are measuring and once connected, then move down the ranges until you get a reading. This is especially true when measuring AMP's.
Now remove the fuses one at a time until the multimeter reading drops to zero and then you have found your problem circuit
Seagrass