seat belt light

werked 66 · 07-05-2002, 09:16 PM

here is my problem i have a 66 coupe under my dash there is a seat belt light has anyone heard of this or seen this working trying to get it to work any help would be great

werked 66 · 07-11-2002, 06:23 PM

so i guess nobody has seen the seatbelt light i was talking about

Metal396 · 07-11-2002, 07:16 PM

my 73 mustang has a similar light on the dash above the glove box.... and in the glove box theres a little buzzer... i will have to try to take a look at it and get back to you to get it workking... i didnt know 66's had them...

66StangGuy · 07-14-2002, 02:11 AM

i have a 66 with the seat belt light you talking about but mine didnt work either.. i think the only thing wrong with it was the bulb was dead but i ended up taking it out completely and using the hole for a switch for my stereo.

werked 66 · 07-15-2002, 07:56 PM

well i hope someone still has it in and can tell me how to get it working

Jeff65 · 07-17-2002, 04:05 PM

The usual problem is the thermal relay used to time the seat belt light is bad. Here's how the system works:

When you turn on the ignition (ON or ACC) power goes to the thermal relay. Its an NC relay hence the seat belt light comes on. After the thermal relay heats up sufficiently, the internal contacts move from the NC position to the open position. This action breaks the connection to the light, so it goes out.

Why doesn't it work:

1. It could be a bad light in your instrument cluster. Replace with a known good lamp and check the connections in the lamp socket. If all is well, look for the thermal relay. I think in a '66 its under the drivers seat.

2. It could be the thermal relay has been removed by a previous owner. This would make the lamp go out and stay that way. The owner may have done this to prevent the light from staying on all the time. Look to see if the relay exists or if its been removed.

3. If you install a new lamp and the lamp comes on but never goes out, it could be a faulty thermal relay. When they go bad, the light stays on all the time which is why some owners just pull the relay and forget about using the seat belt warning. These thermal relays are not made anymore and finding one is like finding elves in the forest...not easy! These can be successfully substituted however. To do it requires electronics technician skills however.

Hope this helps...

07-05-2002, 09:16 PM	#1
werked 66 Registered Member Join Date: Dec 2001 Location: Brooklyn , New York Posts: 45	seat belt light here is my problem i have a 66 coupe under my dash there is a seat belt light has anyone heard of this or seen this working trying to get it to work any help would be great

07-11-2002, 07:16 PM	#3
Metal396 Registered Member Join Date: Jun 2002 Location: Southern California Posts: 109	my 73 mustang has a similar light on the dash above the glove box.... and in the glove box theres a little buzzer... i will have to try to take a look at it and get back to you to get it workking... i didnt know 66's had them... __________________ 1973 Mustang Coupe 351 cleveland 2v heads Edelbrock Performer Intake, Holley 600cfm carb Hooker Headers, 2.5 inch pipes, Magnaflow X-pipe, Flowmaster 2 chamber mufflers with turndowns. Stock Fmx tranny and 2.75 rear end My website:http://www.geocities.com/spddemontc User Rides Index: http://www.mustangworks.com/cgi-bin/...splay.cgi?2541

07-14-2002, 02:11 AM	#4
66StangGuy Registered Member Join Date: Feb 2002 Location: Diamond Bar Posts: 258	i have a 66 with the seat belt light you talking about but mine didnt work either.. i think the only thing wrong with it was the bulb was dead but i ended up taking it out completely and using the hole for a switch for my stereo. __________________ 66 mustang-292-Holley 4160-World Castings Windsor Sr.-Hooker super comp headers-MSD box & Coil.3.55 gears. B&M Z-Gate-Black leather racing seats with 4pt harnes.

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07-11-2002, 06:23 PM	#2
werked 66 Registered Member Join Date: Dec 2001 Location: Brooklyn , New York Posts: 45	so i guess nobody has seen the seatbelt light i was talking about

07-15-2002, 07:56 PM	#5
werked 66 Registered Member Join Date: Dec 2001 Location: Brooklyn , New York Posts: 45	well i hope someone still has it in and can tell me how to get it working

07-17-2002, 04:05 PM	#6
Jeff65 Registered Member Join Date: Jul 2002 Location: Oklahoma City Posts: 208	The usual problem is the thermal relay used to time the seat belt light is bad. Here's how the system works: When you turn on the ignition (ON or ACC) power goes to the thermal relay. Its an NC relay hence the seat belt light comes on. After the thermal relay heats up sufficiently, the internal contacts move from the NC position to the open position. This action breaks the connection to the light, so it goes out. Why doesn't it work: 1. It could be a bad light in your instrument cluster. Replace with a known good lamp and check the connections in the lamp socket. If all is well, look for the thermal relay. I think in a '66 its under the drivers seat. 2. It could be the thermal relay has been removed by a previous owner. This would make the lamp go out and stay that way. The owner may have done this to prevent the light from staying on all the time. Look to see if the relay exists or if its been removed. 3. If you install a new lamp and the lamp comes on but never goes out, it could be a faulty thermal relay. When they go bad, the light stays on all the time which is why some owners just pull the relay and forget about using the seat belt warning. These thermal relays are not made anymore and finding one is like finding elves in the forest...not easy! These can be successfully substituted however. To do it requires electronics technician skills however. Hope this helps...