North American Turbocoupe Organization



Installed headlight relays, now high beams don't work - PROBLEM SOLVED!.
evintho Offline
Senior Member
#1
UPDATE - PROBLEM SOLVED!
Finally got it figured out. One of the pins inside the 8-pin headlight connector broke in half. Just happened to be the high beam pin! Don't know how I missed it the first time. Ran to the junkyard and grabbed the connector from an '86 TC up there. Soldered it in (all 8 wires - PITA) and now all lights work! Bright too!


I just finished wiring in headlight relays ala the tech section write-up. Houston, we have a problem! I installed relays for low beam, high beam and fog lights. The L/B & F/L work and are much brighter. I can hear those relays click on. The problem is the high beams.

When I turn on the high beams, I get no high beams and both the low beams and fog lights go out! I wired the low beams exactly how the article says too. I wired the fogs the same as the low beams. I think my problem is I wired the high beams that way too!

The article says 'follow the grn/blk wire towards the lights to the splice, cut the splice out leaving 2 wires running to the headlights'. I didn't see any splice and nothing shows on my wiring diagrams (the article is for '87-'88, mines an '86). I cut the grn/blk wire between the harness plug and the lights (as I did the lows and fogs) and ran a wire from there (light side) to #87 on the relay. I ran a wire from the other side of the cut (harness side) to #86 on the relay. A wire from ground to #85 and power wire from batt side of the solenoid to #30. It seems to me, with my limited electrical skills, that would work. BTW, I used 5-pin relays for all of them. Talk to me guys, I need help!
Trust in the Lord with all your heart and lean not on your own understanding.
Proverbs 3:5

1986 Turbocoupe 5-spd - New daily driver!
1988 Turbocoupe 5-spd - parts car.
1989 Mustang convertible (Thunderstang). Built '88 TC shortblock, head by Boport, R/R, T3, Bobs log, gutted, rotated, ported mannys, AFPR, LA3, NPR I/C, etc.
Check out Thunderstang!
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DonH Offline
Posting Freak
#2
85 and 86 are the relay coil. 30 and 87 are to the normally open relay switch. You wired it correctly. May be a bad relay or fault in the wiring.

I did the same as you on my 87. Where did you mount the relays?
1987 TC stock except ATR 2.5"
1983 Pontiac Transam T-top 5.7 T56 [email protected] top speed: 176mph
1978 Fairmont 2.3 4-spd Big-top S/W
1946 Willys CJ2A 134.2ci L4 No-top
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evintho Offline
Senior Member
#3
Low and highs on the back and fogs on the front of the left side shock tower.
http://natomessageboard.com/uploads/0000...unting.jpg
Trust in the Lord with all your heart and lean not on your own understanding.
Proverbs 3:5

1986 Turbocoupe 5-spd - New daily driver!
1988 Turbocoupe 5-spd - parts car.
1989 Mustang convertible (Thunderstang). Built '88 TC shortblock, head by Boport, R/R, T3, Bobs log, gutted, rotated, ported mannys, AFPR, LA3, NPR I/C, etc.
Check out Thunderstang!
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Martin Offline
Senior Member
#4
Have you checked for power at the line feeding the relay to make certain when you go to high beam the power is getting to the relay coil, your relay number 86? Also, check to make sure that your ground is good. Relays can be bad out of the box as well, so swap the high beam with the low or fog relay to see if it works.
Martin
Stock 87, no mods, Black with the grey interior.
Boost High, Fly Low
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evintho Offline
Senior Member
#5
Voltage checks are first on the list for this weekend, as are swapping relays and checking all connections. It's probably something stupidly simple that I overlooked!
Trust in the Lord with all your heart and lean not on your own understanding.
Proverbs 3:5

1986 Turbocoupe 5-spd - New daily driver!
1988 Turbocoupe 5-spd - parts car.
1989 Mustang convertible (Thunderstang). Built '88 TC shortblock, head by Boport, R/R, T3, Bobs log, gutted, rotated, ported mannys, AFPR, LA3, NPR I/C, etc.
Check out Thunderstang!
Reply

evintho Offline
Senior Member
#6
Got it!
Trust in the Lord with all your heart and lean not on your own understanding.
Proverbs 3:5

1986 Turbocoupe 5-spd - New daily driver!
1988 Turbocoupe 5-spd - parts car.
1989 Mustang convertible (Thunderstang). Built '88 TC shortblock, head by Boport, R/R, T3, Bobs log, gutted, rotated, ported mannys, AFPR, LA3, NPR I/C, etc.
Check out Thunderstang!
Reply

sbhjr44 Offline
Senior Member
#7
Hey evintho what was it?
Stinger dual3"exhaust from dp & cat to magnaflows w/2.5 outlets w/tailpipes.Homemade CAI w/boost at18psi.MM c/c plates and tubular lca/front coilovers with Koni red adjustables all around. Ported/BV head/A237 and bobslog w/a stinger fmic set-up waiting to go on.86 stang gt w/motor and T-5 from a 86 TC w/3"SS dualexhaust w/cc plates and lowered 1.5".With volvo ic installed.
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Pete D Offline
Administrator
#8
Yes, What was it??
Pete Dunham


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evintho Offline
Senior Member
#9
Sorry guys! Go up top to my first post. I updated it there.
Trust in the Lord with all your heart and lean not on your own understanding.
Proverbs 3:5

1986 Turbocoupe 5-spd - New daily driver!
1988 Turbocoupe 5-spd - parts car.
1989 Mustang convertible (Thunderstang). Built '88 TC shortblock, head by Boport, R/R, T3, Bobs log, gutted, rotated, ported mannys, AFPR, LA3, NPR I/C, etc.
Check out Thunderstang!
Reply

Pete D Offline
Administrator
#10
No wonder we missed it. It was at the beginning!! Big Grin
Thanks for the update
Pete Dunham


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