verslagen1 wrote on 03/03/11 at 23:06:11:Serowbot wrote on 03/03/11 at 22:16:24:So, but why will the light go on when you find the short
Ok, so you plug in a 12v bulb into your fuse box, it lights up. that bulb is made to handle 12v and the highest rated bulb on your bike is about 33 watts. p=iv ohm's law. 33=i12, i=33/12 about 3 amps. When the light is burning bright, you gotta short, when it's dim, normal. to be continued
Quote:and not be on otherwise?... if the short isn't happening, isn't the circuit normal?,... positive, to fuse/bulb, to ground, and bingo... light is on!
Why is the bulb dim? Ohm's law... v=ir, 12=i(resistance of the bulb plus whatever else is on the same line), from above 12=i(4+?) Lets say it's a line to the lights in the speedo, so 12=i(4+8) assuming the wattage of the indicator lights is twice the resistance. i= 12/12, i=1 amp, the light will be half as bright.
Quote:When the short is contacted,...positive goes straight to ground and fire ensues, wires burn, bad bad smells, and no more light...
... or,... if the bulb keeps the current at a safe value, preventing this,... why don't we use bulbs instead of fuses, and never have this problem in the first place...
You remember that anemic magic sh!t box? darn thing shuts down at 10v. That light bulb fuse will steal voltage from the CDI box you'll have a dead savage.
First, thank you for taking the time to open this bukkit O worms.
33 watts. p=iv ohm's law. 33=i12, i=33/12 about 3 amps
I spent 9 months in Biloxi with people trying to teach me electronics & that has got to be the best danged " Get it thru to them" approach I ever saw. I ont hav Ohms law ingrained in my mind like that. All I know is E=IR, the various algebraic convolutions escape me.
The Power aspect of Ohms law always destroyed me. So thanks, I ALMOST appreciate it enough to let ya off the hook for the Majik Sh!tbox for Christmas.
Now, it seems to me that the fuse has no current flow thru it,, OHHHH, Waaait a Minnit! Th problem is, the fuse Blows.. why? OVERcurrent, Why overcurrent? A short,, Oookay, now we ginin here.. So, if the light is bright, its due to greater current flow in the circuit than is "Normal".
Okay, so, I can prove I have a short.. HownaHEKK am I gonna Find that crummy little thing?
So, I Gurgled "How to find a short"
SHORT CIRCUITS
NOTE: Never use a self-powered test light to perform checks for opens or shorts when power is applied to the circuit under test. The test light can be damaged by outside power.
1. Isolate the circuit from power and ground.
2. Connect the self-powered test light or ohmmeter ground clip to a good ground and probe any easy-to-reach point in the circuit.
3. If the light comes on or there is continuity, there is a short somewhere in the circuit.
4. To isolate the short, probe a test point at either end of the isolated circuit (the light should be on or the meter should indicate continuity).
5. Leave the test light probe engaged and sequentially open connectors or switches, remove parts, etc. until the light goes out or continuity is broken.
6. When the light goes out, the short is between the last two circuit components which were opened.
Okay, Im pretty well done, hafta regroup,,
Vers, thankx
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