Electrical 87 Electrical Mess

jrichker · Nov 21, 2015

@Southport2014

You jumpered the flasher socket contacts together, turned the ignition switch to Run and then turned the turn signal to either left or right and got nothing? No steady turn signal lights or either side?

Southport2014 · Nov 21, 2015

That is correct

Southport2014 · Nov 21, 2015

I jumpered the turn signal flasher. Got nothing.

jrichker · Nov 21, 2015

Southport2014 said:
I jumpered the turn signal flasher. Got nothing.

Turn the ignition switch to Run; the engine does not need to be running for these tests. With the turn signal flasher removed, test the pink/orange wire for 12 volts. Remember that the turn signal flasher is not the one on the front of the fuse panel; it is located somewhere else.
Set the voltmeter to DC volts and select the scale that is closest to 12 volts. Clip one voltmeter probe on the bare metal part of the car body for a ground and put the other probe in the turn signal flasher socket contact that has the pink/orange wire. You should see about 12 volts.

No 12 volts present: replace the fuse and check for 12 volts again as described above. Do not turn the ignition switch off if you are testing for voltage.

Still no 12 volts, pull the fuse and test the #5 fuse socket contacts for 12 volts. One contact will have 12 volts. One probe is grounded, the other probe gets stuck in the fuse contacts. Test both contacts for 12 volts.

No 12 volts on either fuse contact, the ignition switch or ignition switch wiring is suspect. Move things around so that you can get to the backside of the ignition switch wiring connector with the ignition switch still connected to it. Make sure that you don't turn the ignition switch OFF while you are testing it. It still needs to be in the Run position. Look for 12 volts on the large gray/yellow wire. No 12 volts and you have a bad ignition switch or some bad wiring. Wiggle the large gray/yellow wire to see if it gets or loses voltage while you are checking it.

Diagrams courtesy of Tmoss & Stang&2birds

Fuse box layout

Ignition switch wiring

Southport2014 · Nov 22, 2015

Ok i got power to the relay. Still no turn signals. I have replaced the relay. I have replaced the fuse. I replaced the ignition switch. I borrowed a brand new turn signal assembly from the store and still did not dix the problem? Do you have any idea what it could be then ? I have a few things not hooked up plug wise i will send pics and maybe something needs plugged in idk . I have 20 hours om trying to figure this out its ridiculous. Picture 3 is the colt meter setting is thay the correct one ? If so the voltage was jumping from 1-6 picture 2 the green plug the other connector is broke does it need to be plugges in ? Picture 4 is a plug under the driver side fender well and i can not find where it plugs too. Pixture6 5 is another plug that is on the driver side and i do not know where it plugs too? Picture 6 has to black and yellow plugs i cant find where they hook into either

Southport2014 · Nov 22, 2015

@jrichker

jrichker · Nov 22, 2015

@Southport2014,
I never said to replace anything. What I advised you to do was to step through the test path I laid out for you. Once you have worked your way through it, you will know why your flashers don't work.

The pictures you posted don't provide much useful information.
Tell me step by step what you observed going through the test path.

Southport2014 · Nov 23, 2015

I have power to the relay. From the purple and orange side .

Southport2014 · Nov 23, 2015

I believe i need tovgo buy amother multimeter becauae i do not see the dc voltage on mine. I have power to relay for sure when key is on. Ao the current is getting that far.

jrichker · Nov 23, 2015

Southport2014 said:
I have power to the relay. From the purple and orange side .

Do you have power to the other side of the turn signal flasher with the ignition switch in Run and either side of the turn signals on?

Southport2014 · Nov 23, 2015

If your referring to the i think light blue wire then no . I have no power to that side (blue wire).

Southport2014 · Nov 23, 2015

@jrichker

jrichker · Nov 23, 2015

@Southport2014
Click on the drawing to enlarge

turn-signal-wiring-87-90-mustang-jpg.545554

All tests done with the ignition switch in the Run position

12 volts at pink/orange wire; yes or no?

12 volts at lt blue wire; yes or no? Try this with the turn signal set for either right turn or left turn and then for no turn..

12 volts at orange/yellow wire; yes or no?

12 volts at the lt green/white wire. Try this with the turn signal set for left turn. Good 12 volts? yes or no.

12 volts at the white/blue wire. Try this with the turn signal set for right turn. Good 12 volts? yes or no.

Southport2014 · Nov 24, 2015

Pink orange- 11.2 volts
Blue wire -no volts at any position left right none
Orange yellow wire - no volts
Green white- no volts
White blue- no volts
@jrichker

Southport2014 · Nov 24, 2015

R tjese turn signal plugs they are tje same colors but have no idea where they go
@jrichker

jrichker · Nov 24, 2015

Southport2014 said:
Pink orange- 11.2 volts
Blue wire -no volts at any position left right none
Orange yellow wire - no volts
Green white- no volts
White blue- no volts
@jrichker

That means the flasher isn't passing power. It is time for a new one.

The diagram set I sent you has a wire color chart (STANDARD CIRCUIT CHART (BY COLOR) on starting on page 9. Use the wire color chart to help you identify circuit names and components You will have to use some intelligence and realize that there are some things not found on a Mustang, like “DIESEL TACH GROUND TO TACH GAUGE MODULE”. That will help eliminate chasing rabbits that go nowhere.

Use the chart to find the wire color and then the circuit name. Use the COMPONENT INDEX on page 18 just before the actual wiring diagrams to find the circuit components location. It has the name of the electrical components in the Mustang; if you picked the DIESEL TACH ground and then didn’t find it in the COMPONENT INDEX, that is a pretty good clue that it isn’t found on a Mustang; go back and look for something else.

The diagrams are laid out in a grid system, numbers along the top and bottom (columns) and letters along the side (rows). The numbers increment by 11 every time there is a new page. The letters A-F are the same on every page. Pages go like this: page 1 starts with 1, page 2 starts with 12, page 3 starts with 23, page 4 starts with 34 and so on until you get to the end; the last page starts with 111. The higher the column number, the further back you are from the front of the car. This helps you get an idea of the physical location of a component. If it says that the location is F-111, that’s not going to be at the front of the car.

Look at location on the COMPONENT INDEX and you'll find turn signal flasher A-27, which turns out to be the 3rd diagram, top of the page, just left of the middle of the page, and on the first row (row A). Each component has the wire colors and circuit number associated with it printed in the wire path. You will notice that the circuit numbers change when power or signal goes in one connection on a component and comes out another connection on the same component. The component socket shape on the diagrams matches the actual socket shape that connects to the component.

Take a connector with wires attached and you can find out what it does. Use the wire color chart to find what the circuit is and then use the index to find the component location. Then make sure the wire colors on the diagram and connector shape match the diagram and you will have successfully identified what the connector plugs into and what it does.

Southport2014 · Nov 24, 2015

Do you mean the tun signal relay ? Or what. Im getting power up to the flasher but none from it to the 4 way flasher module. And where is this standered color chart ? Also did you get thr pictures of the plugs i found they are same color as thr turn signal wires but idk where they hook up at.

madspeed · Nov 24, 2015

swap out the flasher unit

Southport2014 · Nov 24, 2015

My flashers work currently . So i need to replace the flasher switch that goes on the right sode of the drover side dash basically. ? Would that really cause turns not to work

Southport2014 · Nov 24, 2015

Hazard flasher defrost switch ?

Electrical 87 Electrical Mess

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