The following ammeter readings will indicate the type of trouble to look for a No reading indicates an open motor circuit b If wiper operates slowly less than 35 40 rpm at crank arm or not at all and ammeter reading exceeds 4 5 amps loosen armature end play adjusting screw slightly and recheck If ammeter reading returns to approximately 4 5 amps adjust armature and play and tighten lock nut If ammeter reading remains high an internal short or grounded condition is indicated c Disassemble Gear Box and inspect gear for cracked or broken gear teeth d Disassemble wiper motor see Disassembly and inspect or check items shown in Figure 8 135 as required until trouble is located Also check armature on growler 2 Wiper Blades Fail to Park This condition is caused by parking switch contacts fig 8 127 being dirty or broken To inspect and or clean contacts disassemble gear box See Gear Box Disassembly instructions 3 Wiper Fails to Shut Of a Check that wiper motor lead that connects to the No 1 terminal fig 8 133 is not grounded b Check that parking switch contacts fig 8 127 are not frozen bent or burnt together 4 Intermittent Operation Connect wiper as shown in Figure 8 133 and note current draw If current draw does not exceed 4 5 amps a weak circuit breaker is indicated and the brush plate and circuit breaker assembly should be replaced If current draw exceeds 4 5 amps check the various items outlined in Figure 8 135 Specifications Crank Arm Rotation looking at the crank arm Counter Clockwise Operating Voltage 12 VDC Current Draw Free Speed 3 5 4 0 Amp Dry Windshield 4 5 6 0 Amp Stall Current 12 Amp Wiper Crank Arm Speed 35 45 RPM WINDSHIELD WASHER OPTIONAL Description and Operation The windshield washer pump is equipped with a w LEVER ARM RATCHET ARM PUMPING BELLOWS r m z TANG LEVER ARM PIN PLUNGER SLOT ECCENTRIC