Battery cable vs OBC

anix

It appears that the neg battery cable passes through the OBC. If this is so what purpose does this serve. I plain on going to #2 cables, will they pass through the opening or is it ok to go around the side of the bulk head???
Thanks
AL

BGW

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Speedchaser

A cable needs to go through it. Leave the one in it alone. Then run another 2 guage on same connections but go around obc. Make sense?

anix

Yes I understand what you are saying. Does the OBC use the cable to sense amps or does it have something to do with the charging system? Thanks for the tip.

CartTrader

Has to do with the charging system


CartTrader

Speedchaser

What it senses is heresay. Some say it senses pack voltage, which is what I think and others say amperage and thus amount of discharge. Either way the method I described has worked for many.

crash test dummy

From the ClubCar IQ Manual

OBC (On Board Computer) WIRES function explained:

Red(18-gauge) Main power supply for the onboard computer. The vehicle
batteries provide +48 volts to the onboard computer.
White (18-gauge)
The Tow/Run switch provides +48 volts to the OBC through the
white wire when the switch is in the RUN position. When the
Tow/Run switch is in the TOW position, the OBC locks out the
speed controller by not sending a +48 volt signal through the
light blue OBC wire.
Yellow (18-gauge)
Enables the OBC to power-up (brings the OBC out of sleep
mode) when the accelerator pedal is pressed. The MCOR limit
switch provides +48 volts to the OBC when the accelerator pedal
is pressed.
Brown/White (18-gauge) Controls the battery warning light by providing a ground to the
light through a transistor inside the OBC.
Light Blue (18-gauge) Solenoid lockout circuit – the OBC provides a +48 volt signal to
the speed controller when the battery charger is disconnected.
Green/White (18-gauge) Reserved for future use. Wire serves no function at this time
Gray (18-gauge)
Provides a ground for the charger relay when the battery charger
is connected to the vehicle. Also enables the OBC to power-up
(brings the OBC out of sleep mode).
Black (10-gauge) to battery charger receptacle Battery charging current is controlled by the SCR (siliconcontrolled
rec Black (10-gauge) to B– terminal of speed controller tifier) inside the onboard computer.
Black (6-gauge) through onboard computer Allows the hall-effect sensor inside the OBC to measure the
amount of current passing through this wire.

anix

Really good info. Maybe it uses the reading to cycle the charger?
thanks all.

Stevegrmich

. . . the reading determines how much the OBC will allow the charger to replenish the pack . . .

anix

So running a second cable in parallel with the one passing through the OBC shouldn't change what the OBC sences then right? As long as this little trick works I guess there is no sense in over analyzing it. But for future reference I would be curious as to just how it works. The OBC must create a current flow somehow so that it can calculate pac V?? Anyway thanks for the great info. It is great to learn something new everyday..now if I could only figure out how to remember it. When you get a few years on you watch out you may suffer a little CRS lol.

Volt_Ampere

Running a second cable sure will screw up what the OBC is sensing for current! A Hall sensor senses the magnetic field generated by the current flow and thus senses current. It will only sense the current going through it not around it.