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Topic: Testing continuity

in Forum: C3 Electrical


Testing continuity

Posted: 1/26/06 9:06pm Message 11 of 18
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Canada
Joined: 8/6/2004
Posts: 533
Vette(s): Coupe 74 - 454 Drive it like you stole it!
Good stuff!
 
I know exactly what you are talking about.  I have (well... had) two of them.  Yep; I burned one of them a while ago (actually, only the fuse, but I have yet to find one).
 
Tonight I rolled my sleeves and remove almost the entire middle console and finally looked straight in the eyes of the Power Window Relay.  After a long stare and a fair fight; his retaining screw was no match for my wrench.
 
As far as I know (and I went to 4 part stores today), only Zip products have them for sale.  I will be ordering a new one tomorrow. I opened it to see how "bad" it was inside.  The coil (if I can call it that) was in very good condition, but the contact point was very ... used.  I could have sanded the points and give it a shot, but I just don't want to do it again.  It's the second time in les than 2 months that I take the whole middle appart.
 
Using the multimeter, I tested the switches, the circuit breaker and the power window motors.  They all came out good.  So I'll take my change and do a straight replacement of the relay.  Until I get better at diagnostics; it was the most logical decision following the elimination process.
 
Thanks for all the help, I will let you know how this new relay works out for me.



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Testing continuity

Posted: 1/27/06 8:55am Message 12 of 18
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Canada
Joined: 8/6/2004
Posts: 533
Vette(s): Coupe 74 - 454 Drive it like you stole it!
Well, I ordered one from Ecklers this morning..
 
What's the black box next to the power window relay ?  It is a relay for the horn ? Or for the heater ? For the AC ?



Testing continuity

Posted: 1/27/06 11:40am Message 13 of 18
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Suffern, NY - USA
Joined: 3/16/2005
Posts: 227
Vette(s): 1976 restored,new interior,custom paint(purple),body kit,rebuilt engine,trans,upgraded sound system

where was the power window relay exactly,because my power windows recently stopped worked after i was installing a new radio.

I crossed up some wires so I thought i blew a fuse,but checked the fuse with a meter and it was ok, On another thread I asked if there was a fuse link in the wiring, but now after reading your problem,

maybe its the relay




Testing continuity

Posted: 1/27/06 12:03pm Message 14 of 18
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Canada
Joined: 8/6/2004
Posts: 533
Vette(s): Coupe 74 - 454 Drive it like you stole it!
Tony,
 
the relay (at least on a 74) is aligned with the left radio button, under the shift console where it meet with the middle cluster.
 
I was able to reach it without removing the middle cluster.  I first removed the break console, then the shift plate (I left the A/C controls there, but you have to twist things a little to do that).
 
Heres the tricky part: for some reason,  I realized that the "casing" of the middle console is pullable (might not be in yours, but mine was), so I lifted the hand brake as far up as I could, raised the middle console and pulled it out.
 
Bingo!  It was right there. Only has one screw (which double as a ground) and the relay was actually glued to the metal bar is sits on.  Not too hard to pull, but made me wonder for a second if it was permanently attached to it.
 
You'll see the power wire (red) for one prong and the power window wires for the other 2 prongs (I forgot the colors, but pink & brown I think).
 
Funny, because I also replaced my radio recently and had ton's of problems with the cluster bulbs putting it back and now this.  I don't think I created a short though.  I looked inside the switch, and it was kind of what my clock contact used to look like.  After 30 years+, those contacts starts to look tired.  I didn't know how to test the relay by itself, so I just went ahead and ordered one from Ecklers.  If it's not it, at least I won't have (knock on wood) to touch that relay for another 30 years...
 
I'll take a picture tonight and send it to you.  A picture is worth 7 paragraphs..
 
Edit start's here :
 
Here you go! Took a picture.  As you can see, it's under the radio stuck in a corner where only removing the cluster wouldn't help you much; I think you really have to remove the middle console.
 
On the picture it's detached from the wires and bold, but thats were it goes (just not tilted that much...).
 
74-45438744.7730902778


Testing continuity

Posted: 1/31/06 7:50am Message 15 of 18
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Canada
Joined: 8/6/2004
Posts: 533
Vette(s): Coupe 74 - 454 Drive it like you stole it!
Done!
 
It was the power window relay.  Received it last night from Ecklers (41$ shipped).  5 minutes later my windows were back up!
 
btw : also got myself a book about electicity and electronics.  Reading the first few chapters made me feel like I should have listened when I took those classes back in college.  I just didn't care at that time...
 
Thanks everyone!



Testing continuity

Posted: 2/2/06 3:26pm Message 16 of 18
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PERRYSBURG, OH - USA
Joined: 4/23/2004
Posts: 317
Vette(s): 1975 T-Tops,Lite Custom work,Many engine mod. 700R4 trans. body is shaved,17" wheels bf goodrich g-force tires,heavy sway bars front&rear rack&pinion steering,550 slolom springs with gas shocks.

So this made the windows go up as fast as new motors and go all the way up?




Testing continuity

Posted: 2/2/06 3:38pm Message 17 of 18
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Canada
Joined: 8/6/2004
Posts: 533
Vette(s): Coupe 74 - 454 Drive it like you stole it!
All the way up; Yes.  Fast; No!
 
It's still an old motor and my mechanisms are a little rusty and could need re-greasing as well as fixing the angle on the driver side.
 
Since I took the door panels out trying to hot wire the motors, I left them out for now and plan on cleaning the whole inside; which should make them a little faster.



Testing continuity

Posted: 2/2/06 3:49pm Message 18 of 18
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PERRYSBURG, OH - USA
Joined: 4/23/2004
Posts: 317
Vette(s): 1975 T-Tops,Lite Custom work,Many engine mod. 700R4 trans. body is shaved,17" wheels bf goodrich g-force tires,heavy sway bars front&rear rack&pinion steering,550 slolom springs with gas shocks.
OK thanks for the info. Keep up the good work.


in Forum: C3 Electrical


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