Troubleshooting 74 Windshield wipers

[Fishhead]

1974 2002 STD.

My wiper motor works fine when taken off and hooked up to a battery. When plugged back in to the wiring harnees, I get nothing. Wipers dont wipe or move at all. The wipers arent seized and move freely when moved by hand (with the motor removed). I have power to 1 wire of the 5 pole connector at all times.

My Chilton manual has a 3 page wiring diagram and my eyes arent what they used to be. The Chilton has a very tiny schematic and the windshield wiper switch is cut in half between pages 2 and 3. I cant really figure out the specifics(switch/relay,etc) to it because of the split in the wiring schematic.

How does the wiper switch work? Is it grounded through the switch to get the 2 different speeds? How do I find out if I have intermittent wipers( I searched and I found alot of information on the 73's and before).

TIA,

Fishhead

[Napes]

' 74s did not come with intermittent wipers - only the ' 75s & 76s had them from the factory.

Bob Napier

[Fishhead]

http://www.my2002tii.com/wiper_how-to.htm

As per the link above.

I have the intermittent relay (7 wire# 1-353-892) with the 3 position stalk (1-357-011) instead of the 4 position stalk (1-357-913) that would be correct for use with the interval relay.

Could this be the problem with my wipers?

Will the 3 position stalk only work with the non-interval relay(6 wire)?

My car is wired for the intermittent relay.

Any advice would be great. There's not much info on the later model wipers to be found.

Fishhead

[im3crazy]

That could definitely be your problem.

Although this is for a 76, I believe this should work for you as well. I mentioned this in another post today about making sure the cable connectors are seated well by removing and re-seating them after inspection. It is also not unusual for the stalk switches to intermittently fail, as well as the relays get damaged due to water leaks over the years.

I provided a link to a LARGE wiring diagram in a later post here today so I won't repeat it. Also, it's on the forum under a number of much earlier posts from others. I cannot attribute it, but I would if I could.

[Fishhead]

Thanks for the reply.

I am also thinking that the interval relay may only work with the 4 position switch. Information on the squaries seams to be hard to find.

For future reference, heres a link to the post with the wiring diagram for the 1976 (thanks for the wiring schematic).

http://www.bmw2002faq.com/component/option,com_forum/Itemid,50/page,viewtopic/t,333541/

Fishhead

[Fishhead]

I ended up getting an "interval" kit off ebay (4 position wiper switch and relay) and it repaired my problem. My old relay had gone south (it didnt work with 3 or 4 position switch), but when the relay was replaced along with the 4 position switch, my wipers came to life !!