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.

Electric fan voltage drop. Put a diode in series at the alternator on the excite trigger wire. If does not drop then run a heavyer gauge wire between the alternator and junction terminal. I switched to a 170 amp holley alternator along with a new drive setup on my ls and added a 4 awg feed wire. You may double the fan belt or use a serpentine belt so it won t slip.

The voltage drop test is a dynamic test intended for use mainly with high current draw systems such as the starting system charging system or items such as a heater fan electric fuel pump or. Basic voltage drop law v drop ir. There must be little or no voltage drop at the fan motors. Might help you a lot with the voltages your are seeing.

The alternator is tricked into working harder to compensate for the 1 2v difference it is seeing. Grab a volt meter and measure the voltage at the alternator. 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.

I have never had any problem with the battery going dead or any long term charging issues. What the diode does is drops the voltage by about.