electrical help needed please!!!!

[skunk21]

I really need some help guys. I also suck at electrical stuff so I may need some hand holding or I'll have to just give up. here is the problem and what I have done so far....

no directionals or reverse lights, from searching seem do be a huge problem for these cars , and I bought one of them, oh well move on.

first I checked the fuse, checked out okay, put in a new one just in case, nothing, checked all bulbs, found some bad ones still nothing. I have fully working headlights, markers and hazards and those bulbs are okay just no bilnkers or reverse lights.I checked both flasher relays found mine behind the glovebox radio area replaced them swaped them didn't matter nothing, the hazard one clicked when I turned the hazards on so moved that one to the turn signal one but still nothing.

the next thing from reading some posts I searched was replaced the ignition switch on the column still nothing, then bought the big ticket item the multi function switch nothing dead, move the lever nothing . the harness looked fine, nothing loose pulled on the wires everything okay. everything else in the car works fine. I looked under the hood and didn't see any poped fusable links but I pretty much thought if I did other stuff wouldn't be working.

I read another post about the ignition swith and a gray/yellow wire feeding power to fuse #5&#8, Fuse #5 also is the reverse lights, blinkers and #8 is power mirrors etc. but themirrors chime etc work so I ruled that out, I must be getting power down to the fuses right if they are getting power? I read something about the clockspring going bad, but wouldn't you get an airbag light or something?

I need some help guys, I'm not really great with electrical like I said I'm not stupid either, I'll give it a try if I can get some clear guidance. if I can't get it I'm going to have to take it to a shop but they will rape me for sure, most shops hate electrical crap to.

 

[skunk21]

nothing yet, I have faith .

 

[l3lue]

if you figure anything out please let me know..i have no directionals on my car either..sucks

 

[wrenchbender]

The 4-way switch may be bad. I had no turn signals & started to trace it down. The scematic showed that the 4 ways cut off the regular switch when applied. As soon as I touch the 4-way switch they started working again.

 

[skunk21]

not sure if I follow you, are you talking about the switch for the hazards? the hazards work fine. I'll try messing with it but switch seems to function fine.

 

[skunk21]

checked that, it's fine.




nobody has nothing yet, with all the blinker problems with these cars. any Ideas on known grounds to check, wires that go bad anything?

 

[jrichker]

The backup lights use a switch on the side of the transmission to make them work. The wiring harness pushes onto two brass studs on the switch body. If the backup lights do not blow fuses, check the switch.

Jack up the car and place it on jackstands. Disconnect the wiring harness from the switch and bridge the two connectors inside. Turn the ignition switch to run, but do not start the engine. The backup lights shold work if the switch was the only problem.


Diagram courtesy of Tmoss & Stang&2birds

See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host) for help on 88-95 wiring http://www.veryuseful.com/mustang/tech/engine/ Everyone should bookmark this site.

Ignition switch wiring
http://www.veryuseful.com/mustang/tech/engine/images/IgnitionSwitchWiring.gif

Fuel, alternator, A/C and ignition wiring
http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif

Complete computer, actuator & sensor wiring diagram for 88-91 Mass Air Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif

Vacuum diagram 89-93 Mustangs
http://www.veryuseful.com/mustang/tech/engine/images/mustangFoxFordVacuumDiagram.jpg

HVAC vacuum diagram
http://www.veryuseful.com/mustang/tech/engine/images/Mustang_AC_heat_vacuum_controls.gif

TFI module differences & pinout
http://www.veryuseful.com/mustang/tech/engine/images/TFI_5.0_comparison.gif


AutoZone wiring diagrams

http://www.autozone.com/servlet/UiB..._us/0900823d/80/16/71/3c/0900823d8016713c.jsp for 79-88 model Mustangs

http://www.autozone.com/servlet/UiB..._us/0900823d/80/19/59/5a/0900823d8019595a.jsp for 89-93 model Mustangs

http://www.autozone.com/servlet/UiB..._us/0900823d/80/1d/db/3c/0900823d801ddb3c.jsp for 94-98 model Mustangs

 

[cjones]

reverse lamps first:

Key ON

do you have power at fuse #5 15Amp??

if so, do you have power at your Backup Lamp Switch?? Left Hand side of tranny. Pink/Orange wire.

if so, do you have power and ground at the backup bulbs with tranny in reverse??

turn signals:

do you have power at fuse #5 15Amp??

if so, do you have power at the flasher??

if so, do you have power at the Hazard light switch?? Light Blue wire

if so, so you have power on Orange/Yellow wire at Hazard light switch??

Do your hazard lights work??

 

[cjones]

does the blower motor work??

it feeds off the same wire as fuse #5 from the ignition.

 

[skunk21]

I will check the tranny wires and power to the #5 fuse tomorrow.

cjones the hazard lights work and the blower motor works, everything in the car works, but the reverse lights and blinkers, the rear defroster light comes on and the back window feels warm and that is on the same #5 fuse.

 

[cjones]

yes, the relay for the rear defrost is from fuse #5

most likely you have power at #5.

with the hazard lights working the turn signal problem should be between fuse #5 and the multifunction switch. since you changed the multifunction switch that probably isn't the cause but you should still check.

 

[skunk21]

cjones & jrichker thanks for the help on the reverse lights. got home from work and got under the car. found the wires but the end that plugs to the tranny swtich was ripped off , jumped wires over to the switch put it in reverse and have lights, had to solder the wires onto the switch for now until i can track down a new harness piece and I'll get a new switch. ford no longer has the harness plug, no yards around me have foxes I called cjpony parts no luck either.

so now since I have reverse lights now on that circiut along with rear window defrost, I must have power on fuse #5. now lets say I didn't have power to the switch or coming from the switch or the flasher relay how would I bring power to them or would it be a ground problem. I'll play with this tomorrow i picked up a test light, i'll post my results for some help tomorrow keep an eye out. thanks again guys.

 

[skunk21]

no power to the relay or to switch. got hooked up with old ford tech who did alot of wiring, hangs out at his brothers garage that got recomended to me. I'm going to give them a shot. I'll post the results maybe it will help some out on here but it got beyond me. thanks to those who gave me some help though.


:SNSign:

 

[hbracing]

help

started on the same project as you last night lucky for me i have a parts car so it was only a matter swaping parts.after going thru the same steps you did i thought id look on the net and ran across your thread. ive had several mustangs and never had this prblem before.in my searching last night on another forum i found someone else with the same problem somebody posted that there are two flashers, which i had asked a friend of mine who has torn apart several of these he wasnt sure,but its suppose to be blue in color and up behined the glove box area.its supossed to be a bear to get at.i found this late last night and havent had a chance to check it out yet, hope this helps if you get to it before i do.

 

[skunk21]

yes there are 2 flashers, the fuse box one is the hazards and the one behind the glove box area is for the directionals. I found it at the start of my process and found no power to it.

 

[hbracing]

so have you replaced the the signal flasher? according to the wiring diag. if you have power to the reverse lights you have to have power at the signal flasher.

 

[skunk21]

yeah I have replaed it, I may have tested it wrong, I grounded the light right at the fuses panel and I know there is now power to the multi switch, the test light lights up at the fuse which I know that has power anyways, it missing something at the switch for sure and I'm not ripping the harness apart. I'll let someone more qualified open them can of worms. thanks for the help though. I have tried just about everything else you can think of though, replaced fuses, switches relays it's in the wires somewhere.

 

[hbracing]

it looks to me according to the wiring diag that the pwer for the reverse lights and the turn signal flasher feed right off fuse of #5 so in theory if you have reverse lights you should have turn sigs,it looks like the turn signal switch gets its power feed thru the signal flasher,so it might not be that theres no power but rather a grounding issue. i hate to hack up a good harness but if i dont figure something out soon ill start in on the parts car harness.im like you cant belive with as many of these cars with this problem nobody has a fix.

 

[cjones]

greensvt21 - did you say you have no power at the flasher??

to test the rest of the circuit past the flasher, you should put a jumper wire in place of the flasher unit.

if you live in the phoenix area i'll look at it for you.

 

[skunk21]

okay I have power to the fuse, everything else works on that circuit including the reverse lights. I replaced the switched and the flasher relay nothing. so if it should have power, maybe checking wrong wire where would the bad ground be ? at the switch or down the line at the lights? if I can figure this out with bringing into a shop i'm game. pain is getting away from the wiper wires in the harness and getting down to just the blinkers.

sorry not in the phoenix area, damn wish I was could use the help.

so now we are down to a ground issue. told you guys I suck at tracking down this stuff, i can splice and solder though.