Electric Fan Voltage Drop

You may double the fan belt or use a serpentine belt so it won t slip.

Electric fan voltage drop.

Voltage would start off at 14 0 and drop down to 12 5 with both fans on entropy fans are big power hogs and everything else on. Basic voltage drop law v drop ir. I have never had any problem with the battery going dead or any long term charging issues. The actual voltage drop can vary depend on the condition of the wire the conduit being used the temperature the connector the frequency etc.

It is recommended that the voltage drop should be less than 5 under the fully loaded condition. Grab a volt meter and measure the voltage at the alternator. When the air is on and the auxiliary electric fan kicks in my voltage drops from 14 2 down to about 12 5 13. There must be little or no voltage drop at the fan motors.

What the diode does is drops the voltage by about. Might help you a lot with the voltages your are seeing. Put a diode in series at the alternator on the excite trigger wire. I switched to a 170 amp holley alternator along with a new drive setup on my ls and added a 4 awg feed wire.

The alternator is tricked into working harder to compensate for the 1 2v difference it is seeing. If does not drop then run a heavyer gauge wire between the alternator and junction terminal.