need help identifying some wires around engine
Racer
Joined: Mar 2011
Posts: 480
Likes: 42
From: Los Angeles CA
Blower Motor
I think we should just check to see if and where you have voltage.
I am starting at the obvious. Turn ignition switch on and have the console control switch set to heat, and fan speed on low.
1. Check the fuse upper right position. Visual and ohm meter check across the fuse. Fuse OK go to 2. Looking for shorts we will get into that if the fuse keeps popping.
2. Go to the blower resistor and see if voltage is on the brown wire. It is the wire closest to you. Do you have about 11volts? Yes? go to 3.
3. Test the voltage the large red wire on the bottom connector. It should be in the lower left position. It should be about 12v. Yes? Go to 4.
4. Next check the upper connector left position. It should be orange or pick. Turn the fan on high and the relay should activate giving you about 12v at that terminal.
Well let me know how far you have got? Step 1, 2, 3 or 4. We can go from there.
I think we should just check to see if and where you have voltage.
I am starting at the obvious. Turn ignition switch on and have the console control switch set to heat, and fan speed on low.
1. Check the fuse upper right position. Visual and ohm meter check across the fuse. Fuse OK go to 2. Looking for shorts we will get into that if the fuse keeps popping.
2. Go to the blower resistor and see if voltage is on the brown wire. It is the wire closest to you. Do you have about 11volts? Yes? go to 3.
3. Test the voltage the large red wire on the bottom connector. It should be in the lower left position. It should be about 12v. Yes? Go to 4.
4. Next check the upper connector left position. It should be orange or pick. Turn the fan on high and the relay should activate giving you about 12v at that terminal.
Well let me know how far you have got? Step 1, 2, 3 or 4. We can go from there.
Racer
Joined: Mar 2011
Posts: 480
Likes: 42
From: Los Angeles CA
If yes the Purple wire should have voltage? On the high speed blower relay. Yes or no? Fan on high purple wire should have voltage. Yes or no?
If any of these are no it looks like it is the high speed relay.
You can bench check the relay. With no power to the relay you should have continuity between the contacts for the blue and purple contacts. Yes or no? Power the relay on the 2 top contacts ground on the black wire contact and 12v on the other. You should hear a click? Now see if you have continuity between the contacts for the red and purple wire. Yes or no? If all are yes the relay is good. You can try to take the relay apart and see if you can make it work.
Racer
Joined: Mar 2011
Posts: 480
Likes: 42
From: Los Angeles CA
Motor running? Yes or no?
The relay is only for high speed and the top connector does not need to be connected for this test.
Thread Starter
Instructor
Joined: Dec 2013
Posts: 149
Likes: 5
From: VA
yup defiantly have power to the motor now, must have wiggled a wire back in place along the way. 
so tried running ground wire to block and the motor does turn(squeeling abit)
so im guessing it needs a bit of lube, and new ground wire?
so tried running ground wire to block and the motor does turn(squeeling abit)
so im guessing it needs a bit of lube, and new ground wire?
Racer
Joined: Mar 2011
Posts: 480
Likes: 42
From: Los Angeles CA
That is good to hear. I am glad you won't out in that freezing driveway at night for a while.
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Thread Starter
Instructor
Joined: Dec 2013
Posts: 149
Likes: 5
From: VA
ok looks like im not out of the woods yet, looks like when i grounded the black wire on blower motor it was spinning in reverse, i grounded the purple connector and it spins much faster and does not squeel.... so is it pulling power from something else thats grounded from block? are both lines charged? getting no voltage testing between black and purple connectors ,that connect to blower motor, with voltmeter
http://willcoxcorvette.com/popup_ima...?pID=26980.jpg
cant help but wonder if the other end of the black wire , is yanking power from something else
http://willcoxcorvette.com/popup_ima...?pID=26980.jpg
cant help but wonder if the other end of the black wire , is yanking power from something else
Last edited by bikerbilly18; Jan 10, 2014 at 02:31 AM.
Melting Slicks
Joined: Mar 2009
Posts: 3,126
Likes: 15
I see you discovered Willcox's repair help pages. If the motor is running in reverse then the polarity is incorrect. You probably already knew that. You can lubricate the motor. I use Zoom Spout electric motor oil. Access to rear bearing can be achieved by removing the winding cooling tube. I disassembled my original and cleaned it up internally. Second pic. is just before removal after 34 yrs. service. mike...
Last edited by mds3013; Jan 10, 2014 at 07:13 AM.
Racer
Joined: Mar 2011
Posts: 480
Likes: 42
From: Los Angeles CA
ok looks like im not out of the woods yet, looks like when i grounded the black wire on blower motor it was spinning in reverse, i grounded the purple connector and it spins much faster and does not squeel.... so is it pulling power from something else thats grounded from block? are both lines charged? getting no voltage testing between black and purple connectors ,that connect to blower motor, with voltmeter
http://willcoxcorvette.com/popup_ima...?pID=26980.jpg
cant help but wonder if the other end of the black wire , is yanking power from something else
http://willcoxcorvette.com/popup_ima...?pID=26980.jpg
cant help but wonder if the other end of the black wire , is yanking power from something else
Do you know if the relay is working? I would check that all the connections at the resistors , relay connectors and motor are clean and tight. You might have been on the right track when you said you may have hit a loose wire.
Last edited by Frank_Nesta; Jan 10, 2014 at 12:56 PM. Reason: More thinking!
Le Mans Master
Joined: Dec 2007
Posts: 6,422
Likes: 591
From: McHenry Illinois
The reason I asked about the wiper motor is that, there is a black ground wire near the starter that people mistakenly hook up to the large starter terminal with the battery cable. This sends power into the ground wire which is supposed to ground the blower motor as well as the wiper motor. Check between your blower motor ground wire and the engine block to see it there is power there.
Thread Starter
Instructor
Joined: Dec 2013
Posts: 149
Likes: 5
From: VA
75 you were right, the ground for blower motor was on charged line to starter, now i know why wipers has their own ground, now multi meter does show current(about 8v on any speed setting) between the 2 connectors for blower motor, not quite the juice i need to turn the motor but progress none the less.
the red wire to relay still reads 12.3 v, so im loosing some along the way.
the red wire to relay still reads 12.3 v, so im loosing some along the way.
Racer
Joined: Mar 2011
Posts: 480
Likes: 42
From: Los Angeles CA
The red wire is for high or Max AC. The blue wire is the output from the resistors depending on fan speed and the voltage will be different according to fan speed. You can always give the fan blower a separate ground.
Thread Starter
Instructor
Joined: Dec 2013
Posts: 149
Likes: 5
From: VA
2. Go to the blower resistor and see if voltage is on the brown wire. It is the wire closest to you. Do you have about 11volts? Yes
3. Test the voltage the large red wire on the bottom connector. It should be in the lower left position. It should be about 12v. Yes Go to 4.
4. Next check the upper connector left position. It should be orange or pick. Turn the fan on high and the relay should activate giving you about 12v at that terminal.
it runs well if i connect red to moter, and use the normal black as ground, though the relay doesn't make the click when i switch to high fan, but does when i bench test it, , looked inside relay and it doesnt look corroded or shorted anywhere,
but definatly getting about 8-9 volts to motor, it doesn't spin, do i need more voltage or a new blower motor?
3. Test the voltage the large red wire on the bottom connector. It should be in the lower left position. It should be about 12v. Yes Go to 4.
4. Next check the upper connector left position. It should be orange or pick. Turn the fan on high and the relay should activate giving you about 12v at that terminal.
it runs well if i connect red to moter, and use the normal black as ground, though the relay doesn't make the click when i switch to high fan, but does when i bench test it, , looked inside relay and it doesnt look corroded or shorted anywhere,
but definatly getting about 8-9 volts to motor, it doesn't spin, do i need more voltage or a new blower motor?
Racer
Joined: Mar 2011
Posts: 480
Likes: 42
From: Los Angeles CA
Billy, when you put 12v direct to the blower it ran. When you have less voltage it does not run. My guess is that the motor from the screeching sound it needs cleaning and lubing. it is 36 years old. If that does not help. A new motor. Keep us posted.
Thread Starter
Instructor
Joined: Dec 2013
Posts: 149
Likes: 5
From: VA
got a new blower motor and relay, it works well.
installed most of the ducts, heater core installed
will wait for spring to mess with ac
installed most of the ducts, heater core installed
will wait for spring to mess with ac
Last edited by bikerbilly18; Jan 13, 2014 at 10:53 PM.