i just purchased an 89 GT, the previous owner installed new aftermarket head and tail lights, now when you pull back on the turn signal to just flash the lights the damn fuel pump turns on without the key even in the ignitoin. also the oil and fuel gauges dont work at all and the voltage gauge is reading really low (below 12 volts running down the road)
Pat & Amandas Wedding Fund Contributor Posts: 1235
Joined: 9/1/2006 Status: offline
Oil and fuel could also be the sending units.
But I would begin by testing the charging system as well. If ou do not own one, get a voltage meter and learn how to use it. Then find a weekend when you have tons of time and don't need to drive the stang anywhere. Electrical issues like that take some time and can be a PITA.
I personally don't like ford stock guages. Get a mechanical guage and put it on to make sure you have good Oil Pressure, and then you can feel a little better about driving it without the factory guage working.....
I found out that the steering column was updated with a 1990 or newer steering column with the air bag, the 1989 didnt have an air bag, so the wires must be crossed somewhere because of the different years,there was no air bag in 1989. I even tried a different turn signal switch today, that didnt help. the wiring in the car seems to be fine, might be better off changing back to the original steering wheel and turn signal switch?
the gauges are stock,just different year steering wheel and turn signal switch, i think the wiring is different in the 89, compared to the 90-93 with air bag
Pat & Amandas Wedding Fund Contributor Posts: 2903
Joined: 7/21/2003 From: United States Status: offline
Where is your low fuel warning light, on in with the instrument cluster or on the bottom right of the plastic piece that the headlight/hazard switches are attached to
_____________________________
If you have to ask what it takes to get to 500 HP, you don''t have what it takes to get there.
''89 Mustang GT ''86 Mustang vert ''84 Mustang notch turbocharged ''96 Mustan
well the dummy lights are all in the center of the instrument panel, but the plastic housing surrounding the panel has them in the bottom right corner, i see you have an 89, nice by the way, where are yours located?
i fixed it! it was the instrument panel, i put an 89 in it tonight and everything works! it had a 90 or newer in it they are totally different. thanks FOX GT.
Pat & Amandas Wedding Fund Contributor Posts: 2903
Joined: 7/21/2003 From: United States Status: offline
quote:
ORIGINAL: kriesel i see you have an 89, nice by the way, where are yours located?
mine are on the plastic dash piece, they swapped them in '90+. My car doesn't look like that anymore. I drove into a concrete culvard @ 30mph while swerving to avoid a deer. Had it put on a framing machine to straighten the bent frame, then put in many hours with hammers, dollys, bondo, primer, & sand paper. It's charcoal gray now & looks alot better imo, just haven't updated the signature in quite a long time.
quote:
ORIGINAL: kriesel i fixed it! it was the instrument panel, i put an 89 in it tonight and everything works! it had a 90 or newer in it they are totally different. thanks FOX GT.
good to hear you got it fixed. let us know if you have any more problems with it & i'm sure we can get ya fixed up in no time.
< Message edited by FoxGT -- 5/23/2008 2:49:16 AM >
_____________________________
If you have to ask what it takes to get to 500 HP, you don''t have what it takes to get there.
''89 Mustang GT ''86 Mustang vert ''84 Mustang notch turbocharged ''96 Mustan
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electrical problems - 
It's charcoal gray now & looks alot better imo, just haven't updated the signature in quite a long time. 
let us know if you have any more problems with it & i'm sure we can get ya fixed up in no time. 