The windows and wipers on my 1998 Expedition dont work. i have checked all the fuses and replaced the relay switch

Hello! Since there isn't any power relationship between the Power Windows and Wipers, I suspect a fault in the vehicle's grounding...The car has some years on it and this type of grounding problem is quite common...If you have a multimeter and a wee bit of experience using it, here is a test procedure to eliminate grounding as the cause...
Set the meter on the X10 ohm scale...Place one probe on the top center of the Negative Battery Terminal and the other probe on Bare Metal of the chassis (fender bolt is a good location)...You must read close to zero ohms...Leaving the probe on the negative battery terminal, move the other probe to Bare Metal on the engine block...Again reading must be close to zero ohms...If you read 500- 2500 ohms Ground Straps need to be installed from the negative battery terminal to the chassis and from there to the engine block...Guru..............Saailer

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