North American Turbocoupe Organization



turn signals, reverse lights, and boost gauge
Scott Mabe Offline
Member
#1
Hi, New to the forum and I just got a 87 TC. I just put it on the road and found out the turn signals, reverse lights, and boost gauge don't work. I read a couple other threads on the turn signals and boost gauge, but was wondering if there were any other ideas of stuff to check. The turn Signal switch assembly was replaced by previous owner a few years or so ago. I checked the fuses and they seemed fine. The reverse bulbs are good and I haven't even began on the boost gauge. Also just thought of another, the abs light is on. So after all of that, any ideas?
1987 Turbo Coupe
1988 Thunderbird parts car/ possibly street/strip car
1990 F-250HD 460ci
2001 Pontiac Montana (wife's ride)

-PLEASE FORGIVE TYPOS, I USE SWYPE ON MY PHONE-
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zip Offline
Member
#2
Welcome to NATO.

I would take a look into the ignition switch and turn signal flasher for the turn signal issue. Are your High Beams stuck on?

No Reverse lights may be because of a disconnected switch at the transmission.

The boost gauge issue is most likely a split or disconnected vacuum line. The guauges vacuum line runs from the vacuum tree through the firewall to the gauge cluster.
Matt
86 TC 5spd:QH/SD,Walbro190,CFI 52#, AFPR,WB,FMIC,3"dp to axle, .63 T3, E6,Stock Longblock.
Shelf:N/A 2.3, Die grinder, Carbide Burrs.
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Scott Mabe Offline
Member
#3
Actually that was another problem. The high beams will flash but will not stay bright. Also I forgot to mention the hazard lights still work, so does the TC's use a separate relay for the turn signals or the same as the hazzards?

Is there any one spot that tends to break on the vacuum line for the boost gauge or just start tracing the line?
1987 Turbo Coupe
1988 Thunderbird parts car/ possibly street/strip car
1990 F-250HD 460ci
2001 Pontiac Montana (wife's ride)

-PLEASE FORGIVE TYPOS, I USE SWYPE ON MY PHONE-
Reply

Jeff K Offline
Administrator
#4
Separate flashers for turn signals and 4 way flashers.

Just check the vac line from the vac tree to the boost gauge and look for cracks / disconnects.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Scott Mabe Offline
Member
#5
Checked the lines from turbo, definitely could be the problem. Hard to believe it is that much of a mess from the factory. guessing someone changed some stuff. As for the turn signals, replacing the flasher relay didn't help, so I guess I got to keep looking.
1987 Turbo Coupe
1988 Thunderbird parts car/ possibly street/strip car
1990 F-250HD 460ci
2001 Pontiac Montana (wife's ride)

-PLEASE FORGIVE TYPOS, I USE SWYPE ON MY PHONE-
Reply

boboli Offline
Member
#6
If your car is equipped with auto dimming headlights, make sure that it is turned off and then see if the brights will work.
1988 turbo tbird, 5spd, 140k, all stock except boost control valve.
1986 dodge omni glh turbo, 111k, my money pit.
1989 mustang Lx 5.0 convertible, tropical yellow/ tan interior, 1of only 144 made, 164k, aod, all stock including overheating TFI!
89 Jaguar XJS convertible, LT1 conversion, now fighting the prince of darkness (aka Lucas electronics)
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Scott Mabe Offline
Member
#7
I guess the auto dim doesn't work right anymore, you turn that feature off and the highbeams work fine. Still trying to figure out the turn signals though.
1987 Turbo Coupe
1988 Thunderbird parts car/ possibly street/strip car
1990 F-250HD 460ci
2001 Pontiac Montana (wife's ride)

-PLEASE FORGIVE TYPOS, I USE SWYPE ON MY PHONE-
Reply

Scott Mabe Offline
Member
#8
Okay so haven't had much time to look at any of the problems because of Turkey day. Today was double checking the fuses and somehow I overlooked the actual fuse for the turn Signals and reverse lights. Turns out there want one in it. I pulled the fuse for the fog lights and put it in the spot for turn signals. As soon as I did it immediately blew. So apparently I have a short somewhere. Anyone have a good place to start looking?
1987 Turbo Coupe
1988 Thunderbird parts car/ possibly street/strip car
1990 F-250HD 460ci
2001 Pontiac Montana (wife's ride)

-PLEASE FORGIVE TYPOS, I USE SWYPE ON MY PHONE-
Reply

Jeff K Offline
Administrator
#9
Pull the steering column covers and have a look at the MFS connectors and wires as a start. Also check the bulb sockets and bulbs for damage.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
Reply

Scott Mabe Offline
Member
#10
Ok so I was trying to add a couple pictures, but they are too big. I found the problem on my turn signals, apparently the voltage Regulator on the back of the instrument cluster went bad or something because all of the circuits that lead to it are fried, like kfc extra crispy fried. I replaced the fuses with the instrument cluster removed, turn signals and reverse lights work. Now to see if I can figure out something with the voltage Regulator.
1987 Turbo Coupe
1988 Thunderbird parts car/ possibly street/strip car
1990 F-250HD 460ci
2001 Pontiac Montana (wife's ride)

-PLEASE FORGIVE TYPOS, I USE SWYPE ON MY PHONE-
Reply





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