Weird Wipers 76 FJ40

[wombat]

Went wheeling the other day and had the wipers on and off steady for about 6 hours. After about 1 hr instead of parking the wipers went to the bottom park position then jumped up about 2 ins. An hr later the jumped up about 4 ins and then 6 now when i shut them off they go to the park position and the come back about 1/2 way and shut off. Before i tear into it any suggestions?

 

[bsmith123]

wiper science

Wiper Wiring Science

look at the park sw---

everything about wipers is on coolermans site under wiper science

looks like off is going to the run pos maybe

 

[wombat]

I solved the wierd wiper situation yesterday more by accident than mechanical skill. I took the cover off the park mechanism and was adjusting and cleaning the contacts and i touched the brass plate on the gear and it moved. I found that the brass plate is not locked into any set position and is only held firm by the 14mm nut in the middle of the gear. I had to play with it a bit to get the right position(about 7 oclock)see photo it was about 6 oclock. I had this motor apart about 8 months ago to clean and lube because of a noise and when i put it back together i didnt tighten nut up real good i just did it snug like a wheel bearing.My thinking was if i do it up too tight it would wear out a bushing or something.

 

[Coolerman]

Reviving this thread for some further information on the 76-77 wiper wiring.

Excellent information on the parking mechanism for the later wipers. This setup electrically seems to be identical to the early setup but much better implemented.

Now for my question: What is the routing for the harness between the dash mounted wiper switch and the wiper motor on 76-77 FJ40's? (The early harness goes up inside the windshield frame on the drivers side, exits the windshield frame at the top then runs externally across the top to the wiper motor.)

I have been asked to build a harness for this, and since I don't have a 76-77 to see for myself, and none of the pics I have show this, I am asking MUD for help again. This will "interface" to an after market harness. Once figured out I can offer this to anyone using an after market harness to make the wiper connection easier.

 

[cuencanolenny]

I see this is a few years old now but I can tell you what I have found on my 1970. It had one windshield wiper, it is very similar to what Omix-Ada sells for a Jeep CJ3. I do not believe it was factory, nor do I believe this vehicle was made with wipers. The hole is just horribly drilled, not normal to the windshield frame. I was able to do a little work on the inside to improve the out of normal condition but of course it isn't as nice as the new, first time, right side windshield wiper motor installation. I determined that 80CM is the distance between them, there are scallops on the roof/windshield setup. My rig had an aftermarket dome light installed. This unit is grounded to the frame via a mounting screw. However, the wire for it is inside the windshield frame. On the left side, as Coolerman noted, there are two wires coming up out of the top of the frame and the wire for the wiper would have been on the outside of the frame. But the wire to the dome light is inside the frame and I am going to attempt to capture this condition tomorrow and route all three wires (two motors and dome light) inside the frame and will use Rudi's "pull wire" approach, although I will start with a string to get the correct routing and then pull the wires through on it.

 

[cuencanolenny]

I have my "new" 1979 wired and the windshield wipers working. I did re-wire the motor but I suspect that it was dirty brushes that was causing me nightmares as it worked, put it in a box for six weeks, time to install and nothing. Took the motor to a shop, he fiddled with it for a few minutes, voila, two speeds. At home it ran for a moment and then stopped not to start again. So I knew the armature was good, the commutator was good and the brushes have lots of life. So I suspected a weak wire and re-wired it complete. After the first, second and third time it was apart I cleaned the commutator, wrapped fine sandpaper around it and turned it by hand to "seat" the brushes. This time I took my Xacto knife and lightly scraped the brush faces. Anyway, everything worked. So I was finishing up, watching for repetition on the park position and noticed a wobble at the motor. There is a bushing on the shaft and it was coming out of the housing. I was able to washer up behind the linkage arm and tighten the nut, bushing can't come out now. Then I noticed a wobble on the right hand wiper at the pivot through the cowl. Off come the arms and I tighten the nut. Now my question for the Mud crowd.

1) I adjusted the limit screw and nut on the end of the gearbox to contact and backed off 1/2 turn and locked the nut. I found no specification for what the correct adjustment is. Does this sound appropriate? I will "assume" the idea is that the motor shaft doesn't walk much but you don't want it tight either.

2) On the left hand linkage the support bracket has two ears that protrude into the dash area. I note that on the "left" sweep a tick is heard as the linkage hits this bracket, not on the right hand side of the bracket. This bracket can be rotated with the outside nut loose. What is the correct setting?

3) On the right hand linkage the bracket does not have ears. On the cowl itself there is a boss, probably just a piece of sheet metal spot welded to the cowl. It is horizontal. When I tightened the nut on the outside and was back inside watching for any wobble I noticed that my bracket was at an angle and contacting the bottom of the cowl on the left side rather than horizontal. There is nothing other than nut pressure that would position/hold either of these brackets. What is the correct position/tightening.

And by the way, that Coolerman correction for the Toyota wiring is spot on with regards to switching blue/white and blue/black.