1970 Fury Time Delay Relay


Old Man with a Hat
Aug 8, 2014
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Richmond, VA
I have the dash out of my 1970 Fury convertible. As I understand it, when either door is opened, the time delay relay is supposed to turn on a light in the instrument cluster panel that is directly above the headlight and dimmer switch. It's also supposed to turn on an ignition switch light if equipped. (I don't have one of those, but if someone does, would like to see a picture) I believe the relay is supposed to keep those lights on for a certain period of time after the door is shut and then cut them off.

My question: Is there way to test the relay to assure it's working? If not, does anyone know a source for a new relay?
Another option is to run a 2 wire socket in place of the single yellow wire socket and then it could have a battery feed and ground when the door was opened. Has anyone tried that? What lamp socket did you use?

Time Delay Relay

Time Delay Relay Wiring: pink is power, the short yellow wire is ground from the door switch circuits. The other yellow wires are power output, but they weren't connected to anything except the light above the headlight switch

Instrument Cluster Light Panel: the time delay light is the single socket with the yellow wire. The orange wired sockets are just the ones that come on when the headlights are turned on.

The wiring harness looks good overall. Definitely not butchered. Would just like make sure the time delay circuit is working before I put everything back together. I'm going to paint the dash black and install a black vinyl shell.

Dash isn't cut up either
Is this a "relay" or a "timer"? If it already has access to the dome light circuit, probably a "timer", which could be bypassed if necessary and still complete the circuit initiated by the done light circuit. Maybe?

The ignition light was on the 69 fury model. It was on the lower left of the dash. There were 2 styles of light holders- one was part of a mounting ring that installed with the ignition switch ( I have a picture of this one)the other light clipped on to the metal part of the dash just above the ignition switch. This is the style in my car now. Here are some pictures of the light, wires and of a non working time delay relay. I don’t know how to test them. I have seen them for sale on eBay for big bucks.
My relay controls a light just above the ignition switch and another light above the dash switches just above the windshield wiper switch it illuminates the convertible switch, hazards , head lights and such. It goes on when I open either of my doors and stays on for 30 seconds. It is a very cool option at night. I have replaced my relay twice in 32 years. If you look closely at the relay in my pictures you will see 2 tiny wires, one of them looks like it’s broke and not attached to anything- I think that’s the issue with my non working relay
The pictures look more like a "flasher" than a relay. The two pieces of metal should be touching, then as current flows, one heats up and springs away from the other one, just like a signal flasher cycling once. A simple "timer".

A "relay" would use a lighter voltage to control/switch a circuit with a larger voltage/amp load. No switching, per se.

It looks to be a simple timer. Thanks for the explanation CBODY67. Even though this isn’t my thread It never ceases to amaze me the things you can learn on FCBO.
Here are some pictures of the timer and the wiring going to it before I took the timer apart . There was no part number stamped on it , maybe it was a ink stamp that wore off or a sticker that fell off
Thanks Welder Guy and CBody67: I got the term: Time Delay Relay from the instrument panel wiring diagram in my 1970 factory shop manual. I suppose like Welder Guy says, it's a timer that is supposed to go off after 30 seconds. It's also a relay in that it takes power and relays it to instrument panel lighting when ground is provided by opening one of the car doors.

There is no continuity across any of the terminals. From Welder Guy's picture, it looks like there should be continuity from power to ground, i.e. from the first pole with red coating to the second with red coating. With mine, since power can't ground, probably because of the same broken wire, my relay is probably junk. I was thinking that I could take an old battery and wire the power to relay power and ground to relay ground and use a voltmeter to see if I got power at the light socket. I was hesitant to do it, because I don't like running 18 gage wires direct off a battery. With no continuity and Welder Guy's pic, it looks like a waste of time anyway.
I suspect that most of those wires are 12 gauge, as 18 gauge would be smaller.

I suspect that most of those wires are 12 gauge, as 18 gauge would be smaller.

Hi Cbody67: I meant just attaching the wiring harness for the time delay relay to the battery. All the wires in that little harness, both input and output, are 18 gage at least according to the 1970 factory shop manual. That doesn’t matter so much however, because I found a spare time delay relay, which does have continuity across power and ground. The resistance is 37.4 ohms, which I think is kind of high. I was wondering if you think that such a high resistance makes it garbage or near garbage?
Hi JCT, have you used this with a 1969-1970 wiring harness? Did it give you 30 sec elapsed time before shutting off? Since AutoZone calls it an ignition relay, I just wanted to see if you've used it. Thanks!

my 68 newport uses the same part for the ign illumination light, and it does work just fine. i just didn't time how long it stays on. i read some where maybe it was in the fsm (?) the longer the door is open the longer the longer it stays on...