My Ramcharger fans not going into Hi speed...any ideas why

[THE BLACK MAMBA]

I just installed a Casper Electronics fan Hi/LO switch on my ramcharger fan, but both speed on the switch are the same...any ideas on how to get it to go on Hi speed? Ive been doing a search but no luck....any help or ideas will do....thanks

 

[pacecarta]

are you running the casper adapter or casper hotwire ?
if you are you are in high speed only running on the OE low side realay and not using the OE high side relay
the hi/ low uses the OE high and low relay through the ac fan cotrol switch but as i said their adapter and hotwire only makes use of the low side relay so you wont see any change
wish i could tell you why they wire the adapter or hotwire like that but im at a loss

if you have the racetronix hotwire kit on the dual fans all functions as original and the hi low works

 

[THE BLACK MAMBA]

I just have the adapter that came with the fan

 

[pacecarta]

check the wiring on that adapter youll find that from the OE connector side only two of the pins have wires , the ground and the low side relay power . the fan side of the adapter is wired to ground and the yellow and green wires of the fan and that gives you high speed on the fans ,puts a lot of load on the OE low relay and if it fails the high side switch (224 * overheat safety switch) on the intake will turn on the high side relay but it wont turn the fans on because its not connected to the fan with that adapter

i usually run the RTX hotwire which uses an OE connector that you must install on the fan harness or on the cheap cut the OE connector off the old OE fan and then wire it to the dual fan running the yellow fan wires to low side (A) and green wires to high side (B) and black ground (and a brown on some dual fans with 4 wire plugs ) to (C) then it functions in low and high as the original fans did