Washer suddenly stopped working. Van is chassis for my motorhome so has been parked sinice fall. Washer does not work. I find 3 fuses related to "wipers" but none for the washer. Before I tear the front of the van apart to get to the washer pump I would like to confirm the fuse and electrics are OK. How can I check? or do I need to disassemble the front of the van to get to the washer pump?