Ad Radar
MENU Subscribe to a Magazine
  • Sign in
  • Join

Subscribe to Print or Digital! Save up to 83%

Muscle Mustangs & Fast Fords Magazine Muscle Mustangs & Fast Fords
Mustang Monthly Magazine Mustang Monthly
5.0 Mustang & Super Fords Magazine 5.0 Mustang & Super Fords
Modified Mustangs & Fords Magazine Modified Mustangs & Fords
  • Print Subscriptions
  • Digital Subscriptions
  • Gift Subscriptions
  • Subscriber Services
  • Back Issues
  • Personalized Cover
  • Subscribe to a Magazine
Item Posts    Sort Order

1990 CONVERTIBLE PUMP WIRING DIAGRAM

 
peterwilliam
New User
Posts: 4
Joined: 12/12
Posted: 12/09/12 08:55 AM

HI EVERYBODY,
I RECENTLY BOUGHT A 1990 LX CONVERTIBLE, IM TRYING TO REPAIR THIS CONVERTIBLE SYSTEM AND GET IT WORKING BUT I NEED A WIRING DIAGRAM.I CAN HEAR THE RELAYS CLICKING BUT NOTHING HAPPENS. AT THE PLUG THAT CONNECTS TO THE RELAYS, ONLY GET 12V WHEN ACTIVATING THE SWITCH, I BELIEVE THERE SHOLD BE ANOTHER LINE WITH 12V JUST WAITING FOR THIS RELAYS TO BE MADE SO IT SENDS THE VOLTAGE TO THE PUMP, I CHECK FUSES AND ALL OF THEM ARE GOOD.IM GOING TO BE DOING A LOT OF ELECTRIC REPAIRS ON THIS CAR, THIS IS JUST WHAT I START WITH.I HAVE NO REFERRENCES AT ALL (OWNERS MANUAL)AND ELECTRIC WIRING DIAGRAM.

IS THERE A WEB SITE I CAN (FREE CHARGE) DOWN LOAD THIS ELECTRIC DIAGRAM FOR THE CONVERTIBLE TOP PUMP DIAGRAM?

IS THERE A BOOK FOR ALL THE ELECTRIC DIAGRAM FOR THIS CAR?  

Post Reply
waynep71222
Enthusiast
Posts: 455
Joined: 04/12
Posted: 12/09/12 09:57 AM

this is for a slightly later model.. probably the same..

http://forums.mustangmonthly.com/70/9193363/1979-1993-mustangs/1993-mustang-convertible-top-died/  

Post Reply
peterwilliam
New User
Posts: 4
Joined: 12/12
Posted: 12/10/12 05:16 AM

thanks a bunch, seems like i got in the right place. Again thanks.  

Post Reply
MustangMan
Moderator
Posts: 261
Joined: 08/11
Posted: 12/10/12 08:05 AM

Peter, if you are going to be doing a lot of electrical repairs/upgrades, I HIGHLY suggest you find the 1990 Mustang Electrical and Vacuum Troubleshooting Manual (EVTM). They are produced by HELM Inc. Not sure if you can still get directly from HELM, but I see them on eBay from time to time. Search for "1990 Mustang EVTM" and you'll find it. For the $20 or so for the book you will save a LOT of time searching the 'net for wiring diagrams, etc. Even though we have the books here for reference, I bought my own EVTM to have at the house (own a '90 as well)...

HTH...
Mark
.  
Mark Houlahan
Brand Manager
Mustang Monthly Magazine

1965 FFR Roadster 427W/TKO-600 5-speed
1966 Mustang 289-4V/C4 Auto
1968 Mustang 4.6L Three-Valve/5R55S Auto
1990 Mustang 306/AOD
2002 Explorer Sport Trac 4.0L V-6/5R55 Auto
2005 F-150 4x2 4.2L V-6/4R70W Auto

Post Reply
peterwilliam
New User
Posts: 4
Joined: 12/12
Posted: 12/10/12 09:37 PM

thank you Mark,this is exactly what I need.  

Post Reply
peterwilliam
New User
Posts: 4
Joined: 12/12
Posted: 12/23/12 08:42 AM

what is a good web site for car painting simulator? has any of you guys tryed this before? how good this works for you?  

Post Reply
ryan1990LX
New User
Posts: 3
Joined: 05/13
Posted: 05/12/13 07:39 PM

Just curious if you ever got the top working and what ended up being the problem? I just got a 1990 with the same problem. Any help would be much appreciated, Thanks Ryan  

Post Reply
waynep712222
User
Posts: 223
Joined: 04/13
Posted: 05/13/13 07:32 AM

ryan...   can you hear the relays clicking when you operate the switch???


here is the wiring diagram for the top controls...   i edited the image and included the relays to make it easier to understand.


Mustang 90 Convertabletopdiagram Zps34dbbfb6  

Post Reply
ryan1990LX
New User
Posts: 3
Joined: 05/13
Posted: 05/13/13 05:50 PM

Thanks, Waynep72222
Yes, I can here them clicking and they have been replaced. It looks like I need to find the circuit breaker. Any Idea where to look? Thanks again  

Post Reply
waynep712222
User
Posts: 223
Joined: 04/13
Posted: 05/13/13 09:39 PM

ryan... pull both relays...

find terminal 3 and 4.. the 2 wide blades....

one of those on either relay socket will have power....  

do you have at lease one of the old relays... if you *** remove the cover so you expose the inner workings..

plug it into one or the other side...  squeeze the contacts for a second.. does the pump start running??? move the bare relay to the other side... does it run in that direction...


there are 3 wires on the pump..

red runs the top up usually.

yellow runs the top down usually..

black is the ground connect and since electrons flow from negative to positive... if you don't have that wire properly grounded... all the connection thru the relays would never make the motor turn..

but.. please... do me another favor...

open the hood...

on both sides of the core support are ground wire connections... please verify they are intact and tight..  not frayed ...

there is also a battery negative battery cable connection from the terminal to the inner fender..

i put green squares around the obvious ground connections under the hood... can you see 4 squares??

1992Mustang50batterycablegrounds  

Post Reply
MustangMan
Moderator
Posts: 261
Joined: 08/11
Posted: 05/14/13 08:30 AM

The circuit breaker is located under the dash on the driver's side. It's tough to explain, but it is taped up with the harness and is close to the low-oil relay and the intermittent wiper delay control box. It's not mounted to anything from what I can see in the wiring diagram I looked at, so just look for a circuit breaker taped up to the main wiring harness to the left of the steering column. Verify it is the right breaker by noting the black/yellow wires going in/out of the connector.

HTH...
Mark
.  
Mark Houlahan
Brand Manager
Mustang Monthly Magazine

1965 FFR Roadster 427W/TKO-600 5-speed
1966 Mustang 289-4V/C4 Auto
1968 Mustang 4.6L Three-Valve/5R55S Auto
1990 Mustang 306/AOD
2002 Explorer Sport Trac 4.0L V-6/5R55 Auto
2005 F-150 4x2 4.2L V-6/4R70W Auto

Post Reply
ryan1990LX
New User
Posts: 3
Joined: 05/13
Posted: 05/14/13 07:25 PM

First off I am getting power to the relays but it is minimal 0.5VDC. I  was able to locate all of those grounding points and they are shotty. I am going to get some new lugs and bolts and go from there. I couldn't find the circuit breaker under the dash but I'm not sure that wiring diagram is correct for a 1990 because there is no black/yellow wire and the wires from the switch are different colors as well. I will let you know how the ground replacement works. Once again thank you all for your help. Much Appreciated  

Post Reply
waynep712222
User
Posts: 223
Joined: 04/13
Posted: 05/14/13 09:58 PM

start with a stainless steel wire tooth brush with a wooden handle from the hardware or paint store.. under 5 bucks...

Stainlesssteeltoothbrush2

you will also want to take the terminals off the battery positive side of the starter relay and wire brush everything... count wires before taking off.. count as you reinstall them..

i had to fix some grounds on a 97 tbird.... ugly i know...

one of the wires to the fan was 8 gauge... used BIG terminals from the parts store...  
red or pink is 18 to 22
blue is 14 -16 gauge
yellow is 10-12 gauge
big  red or pink is 8 gauge..

Dorman/Conduct-Tite 8 gauge 1/4 in. ring terminal Part Number: 85246
most parts stores also sell gold plated 1/4 and 3/8, 8 gauge ring terminals ...
you may need to extend some of the wires also..

Dorman/Conduct-Tite red butt connector for interior connection Part Number: 85264 Type: Butt Connector 8 Gauge
anything else thicker is battery cable ring terminals..


Groundedproperly

run the second half of this test.. parts 1 thru 4 to verify you have fixed the ground issues..

VOLTAGE Drop Testing  

Post Reply
MustangMan
Moderator
Posts: 261
Joined: 08/11
Posted: 05/15/13 06:45 AM

Don't forget the fusible link. That's mounted right on your starter solenoid and could be bad. Check there for the fusible link's condition and to verify the black/yellow wire coloring. I was looking in an '89 wiring manual yesterday, but it appears to be the same color wire in '88 and '87 as well, so should be the same up through '93. Ford doesn't have a habit of changing wire colors/codes annually.

For example red/blue stripe for start circuit has been like that for six decades.

HTH...
Mark
.  
Mark Houlahan
Brand Manager
Mustang Monthly Magazine

1965 FFR Roadster 427W/TKO-600 5-speed
1966 Mustang 289-4V/C4 Auto
1968 Mustang 4.6L Three-Valve/5R55S Auto
1990 Mustang 306/AOD
2002 Explorer Sport Trac 4.0L V-6/5R55 Auto
2005 F-150 4x2 4.2L V-6/4R70W Auto

Post Reply