Electric Fan Voltage Drop

Basic voltage drop law v drop ir.

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. If dip to 11 volts then your alternator is either not delivering the 100 amps or the fan belt is slipping. Put a diode in series at the alternator on the excite trigger wire. The alternator is tricked into working harder to compensate for the 1 2v difference it is seeing.

You may double the fan belt or use a serpentine belt so it won t slip. There must be little or no voltage drop at the fan motors. Might help you a lot with the voltages your are seeing. The actual voltage drop can vary depend on the condition of the wire the conduit being used the temperature the connector the frequency etc.

When electric fan installs don t perform as expected the problems are often traceable to under wiring and or poor splices and grounds. If does not drop then run a heavyer gauge wire between the alternator and junction terminal. Grab a volt meter and measure the voltage at the alternator. 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.