A Wiper Inoperative The following ammeter readings will provide a hint as to where trouble might be located Ammeter Reading Check the Following Approx 2 amps Open armature hung brushes solder connections broken green lead etc See Figure 8 151 0 Dirty or defective circuit breaker contacts solder connections at circuit breaker terminals See Figure 8 151 Approx 13 amps Broken gear or some similar condition that would stall the wiper B Wiper Will Not Shut Off 1 Check that wiper has Lo speed If wiper has only one speed fast look for an open shunt field circuit See Figure 8 151 2 Check that parking switch contacts are opening as follows a Remove wiper gear from housing See Disassembly Procedure and check that parking switch contacts are not stuck or bent together b To double check operation of park switch slide gear and shaft out of housing far enough to disengage gear teeth from worm shaft Turn gear so that gap in ring can be positioned over the raised part of the parking switch and slide gear back in housing Connect a test light as shown in Figure 8 154 Test lamp should not light 3 If the checks in step 1 fail to locate the trouble look for a grounded condition in the green lead C Wiper Has One Speed Fast 1 Check for an open shunt field circuit fig 8 151 D Wiper Has One Speed Slow 1 Look for a grounded condition in the shunt field circuit fig 8 151 I u 1111 i 4 s A i Q r i 1 Fig 8 154 Test Lamp Connections E Wiper Crank Arm Stops Rotating Immediately When Jumper No 2 Is Disconnected From Ground i e stops in any position 1 Check that parking switch contacts are not dirty bent or broken F Wiper Speed Normal In L But Too Fast In Hi board Wiper cycles on and off automatically 1 Operate wiper in Lo speed and observe current draw specification n table check the following items a Armature end play too tight b Armature shorted or grounded c Field Assembly shorted d Gear Assembly end play tight If current draw is normal a defective circuit indicated should replaced