Batt light mod doesn't work!

I put a 4.7K ohm resistor on the circuit today, but it didn't fix the problem. I still get the batt light on. I put my DMM in line between the resistor(hooked to the tail light circuit), and the batt line. Read about 8 volts. So what gives here?

 

Ouch! That's a bit much in the DMM. Did you read from the sensor side of the resistor (on the battery side) or the computer side? You should be able to read voltage from what ever point of referrence to ground, not another circuit, it can be confusing and give you bad readings. I would read what the voltage is from the cell that the sensor on the battery is located in and determine how much voltage you should be reading and then calculate the needed resistance from there. Remember Resistance = Voltage / Current (Amps). Let's assume that the computer doesn't want to see more than 500 milliamps (1/2 amp) maximum and you are using the voltage you measured out of the battery cell for your voltage quantity, you should be able to figure out the needed resistance from here, right?

 

I have no idea what cell it would like to be reading. Nor do I know of a way to test the voltage in the cell, either. And I should clarify(because I get the impression you are misunderstanding me), that I have no sensor on my battery. I didn't know of such things when I bought my Autozone special battery for the bike. And since then I have heard the Yuasa is expensive.

After doing my reading, I poked my DMM into the wires going to the back of the bike. Found that when on, the blue wire has 12V. So, I tapped into that wire, put on the resistor(radioshack 4.7K ohm 1/2W), then used a bullet connector to snap it onto the white/red bullet that was hanging there. Batt light stayed on, so I started poking around with the DMM. Resistor to ground yielded 12V. Resistor(via DMM) to white/red wire yielded the 8V.

 

Speedwagon, try looking at this link....

http://home.netcom.com/~rvtucker/battwarn.htm

 

Yes, that's what I read, that's what I did. Doesn't work.

 

I pulled the connector off my battery sensor and between it and ground I got 6.5 volts.
The sensor that I using, ( I found in my boxes of bike parts ) has a resistor wired in it and is a push in style at the battery, so it's not a Yamaha original ( those were screw in ).

I'll check into this a bit further when I get home from work tonight!