[Forman 400]

I have a 1998 foreman 400.Sometimes when i start it the oil light comes on and stays on for a while.It usually goes out after awhile.Iknow the oil is not hot because it does it some as soon as i start it.Is there a sensor that could be bad ,if so where is it.

Thanks

 

[Goober]

Two components potentially: oil temp sensor and Fan Control Unit. Troubleshooting procedures for these are in the manual.
I had to replace the FCU ($190).

 

[Forman 400]

Ok i think my sensor is bad.It is supposed to measure 9.5-10.5k ohmes but it measures 18k.The price for a new one is to much so i think i will hook it up direct to a switch.My question is do i need a relay or can i go directly from the switch.

Thanks

 

[Goober]

Ok i think my sensor is bad.It is supposed to measure 9.5-10.5k ohmes but it measures 18k.The price for a new one is to much so i think i will hook it up direct to a switch.My question is do i need a relay or can i go directly from the switch.

Thanks

Yes your sensor appears to test out of tolerance but I think something wrong with the value—a high resistance should, to my understanding, inhibit the light function. Anyway, a new sensor costs $39 through the Rocky Mtn link below but you can search the part number on eBay and likely get it for less. It’s under the “Crank case” IPB.

There’s no good reason to hook it up to a switch. So you can turn the light off on on? There’s a mod you can build called a trim-pot (adjustable potentiometer) but that’s not a beginner mod.

 

[Forman 400]

Is that price Canadian or US and is it aftermarket or oem

 

[Goober]

Is that price Canadian or US and is it aftermarket or oem

Research your part number I think it is correct as shown in the pic