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Re: wipers not working - blowing fuse (2) Posted by Saana88 [Email]  (#207)  [Profile/Gallery]
(more from Saana88) on Mon, 4 Oct 2004 18:50:37
In Reply to: wipers not working - blowing fuse (2), James Diefenderfer, Mon, 4 Oct 2004 18:00:22 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I've never had problems with wiper motors, but I've only had three in the family. However, two of them had failures in the wiper linkage itself.
Find out what's blowing the fuse- will the wipers work fine until the moment you hit the washers? If that's the case, there is a short somewhere in the washer circuit. If the washer isn't blowing the fuse, proceed.
The fuse will blow if:
1. There's a short in the wiring, or the wiper relay has shorted, anywhere on that circuit.
2. The motor is worn enough that it draws the required current (10-15 Amps? whatever the fuse rating is) to blow the fuse
3. You had a defective fuse (rare).
The motor will draw lots of current if:
1. Internal wear (usually accompanied by a burnt-plastic smell) has killed the motor.
2. The wiper linkage has stopped moving smoothly, which forces the motor to work harder, drawing more current.
Check the linkage first!
1. Open the hood and fold the wiper arms so they are off the windshield.
2. Try the motor with a new fuse- it should move the wipers. If that does nothing, then
3. Unplug the wiring harness from the wiper motor, disconnect the motor from the linkage (one bolt and pull the short arm of the linkage off of the motor's output rod)
4. Plug the wiring harness back in (don't let your fingers get in the way) and try the motor again. Replace fuses when necessary throughout the operation.
IF the motor blows the fuse even when it's not connected to the linkage,
OR the motor spins slowly or not at all when it's not connected to the linkage,
The motor is bad. Get one from a junkyard or eBay- they are sturdy little buggers.
Otherwise,
5. Grab on to one of the wiper arms and move them around as they normally would (but still off the windshield, linkage still disconnected), or otherwise manipulate the wiper linkage looking for resistance.
IF the linkage is difficult to move around, OR you feel binding or other resistance, enough to slow down, say, an electric motor
THEN the linkage needs to be disassembled and lubed up.
HOW THE HECK DO I KNOW THIS?
1. '90 900, wipers worked slowly, then so slowly that they stalled and wouldn't work unless I pushed them across the windshield- remove linkage, lube, and reassemble
2. '88 900, wipers made a loud banging noise (attached to the firewall) and then only the passenger wiper worked. Rain-X is a good idea here. The passenger wiper is driven directly by the motor, but the driver's side wiper is driven through the eccentric pulley and cable linkage. The cable had derailed from the pulley and the pulley came off of the shaft that connects it to the driver's side wiper. Reassemble wiper linkage, or replace the whole unit with one from a junkyard.
Questions? E-mail me.
posted by 66.218.1...
, Mon, 4 Oct 2004 18:50:37 <-- Viewing This Message
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