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Another Wiper malfunction question
Just got a 74 911 and have been having fun figuring out how stuff works. :) My first project, wipers...
So the wipers were broke when I got it. I assumed switch or motor since the fuse was good. Well after tearing everything down and benchtesting it all I'm stumped. Here is what I have so far: Symptom: Nothing happens at all on wiper or wash. Switch: Cleaned and benchtested, contacts being made, not sure if all are working as designed but it appears that way Motor: cleaned and bench tested, runs fine when power applied on 2 prongs, nothing on the others, not sure where it should run when power is applied. Relay: incorrect, horn relay is installed according to the pin #s. I assume if this is a bad thing, it should only impact intermitent selections. Output: Testing power to the motor here is where I see it (yes the batt is low): Pos0 (straight out): Red/wh and Blk/purple with 11.5v Pos1: Blk/purple only with 11.5v Pos2: Blk/Yellow only with 11.5v Pos3: Grn with only 11.5v Never got any power on blue (washer initiated right?) Any advice? Thanks, Pat |
Slight update.
My outputs above are incorrect. Didn't look at all them but here is the story on pos2 (low speed). Pos 2 has power to blk/ylw and red/wht. When I connect al the wires to the motor except blk/ylw. I can read power on red/wht and blue? so red/wht and blue must be shorted, I'm just not sure if they are shorted on purpose or not. I still have power on blk/ylw. As soon as blk/ylw makes contact, I get 0 readings on every terminal including blk/ylw and red/wht. What sense does that make? If I run power straight from battery to the terminal where blk/ylw is connected it runs fine. So what am I missing here? Pat |
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Thanks Ronin, read both of those before posting, and checked everything they mention.
Any idea what the motor connections should be? Mine are:   ;- R/W | Bk/P | G - Bk/Y   ;- Bl Pat |
Quote:
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That Blue/White 53e south connection should be on a rotating contact to enable the wipers to stop in the parked position after being turned "off"........Ron
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My diagram is slightly different than the image you posted.
According to Haynes Diagram I have for the 74... It's similar except that the blue goes straight to the motor (not to relay) and red/white also goes to the motor. In fact there is no relay at all ???? So I wonder what the relay I checked is really for then? Anyway... At this point I'm assuming I have a corroded connection somewhere. I bypassed the fuse with jumpers and still had no luck, so it looks like I'll be doing some more tracing work in the morning... Thanks again for the help. Pat |
[QUOTE]Originally posted by Pat S
"My diagram is slightly different than the image you posted." --- the dia. should be for mid '70s foreward.. do you have the Intermittent Control? "except that the blue goes straight to the motor (not to relay) " --- so you don"t have an Intermitent Control[relay].. and the posted Blue/White wire is really all Blue wire on your diag. which is connected to the "off" rotating contact to park the wipers. "and red/white also goes to the motor." --- It looks like the Red/White also goes to the rotating contact inside the housing "In fact there is no relay at all ???? So I wonder what the relay I checked is really for then? Anyway..." --- LOL.. maybe it's for the washer pump.. it's gotta be that.. "At this point I'm assuming I have a corroded connection somewhere." --- the wiper switch is the routine answer to these wild problems.. the interior of the motor housing, and it's rotating contact is another weak area, IMO http://www.pelicanparts.com/support/smileys/ura.gif |
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