When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
#2 is "Ambient Temperature Sensor". It IS plugged into the sensor, which is attached to the firewall by one of the studs on the C100 connector. #2 is fine the way it is. You have the correct connector on it, the wire colors are correct.
#4: The courtesy light should be one pink/wht, one white. Possibly #4, I see a white, but the other wire isn't obviously pink/wht. If it is, check the pnk/wht wire for 12V to ground. It should be hot at all times if the clk/ctsy fuse is good.
#3: There is a connector for the brake switch for the cruise control. gry/blk and dk blue. Possibly #3? But I don't see the switch. I see the empty hole in the bracket below the brake light switch. There should also be a 1/4" vacuum hose that goes on this switch too. The hose comes from the servo above the battery.
EDIT/ADD: I don't see the hose, the switch, or the mating plug for the 4-wire connector comes out of the stalk for the Cruise Control. 1,800 1984s did NOT have cruise. Is yours one of them? Look on the Service Parts Identification Label for K34. If the code isn't there, and neither is the servo by the battery (or forward under the left headlight if it is an early car and the campaign was never completed), you car doesn't have K34, and #1 and #3 aren't connected.
Thank you for the info and help, i do not have cruise, but seem to have the wire for it
You should disregard everything that has been posted and buy a FSM, you really can't work on these cars without one. You should buy one and read it cover to cover twice.
You should disregard everything that has been posted and buy a FSM, you really can't work on these cars without one. You should buy one and read it cover to cover twice.
For an 84 you also need the Electrical Trouble Shooting Guide (section 8) Which is sold separately.
But I don’t think you should disregard anything
Last edited by GregMartin; Oct 15, 2019 at 05:36 PM.
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
#2 is "Ambient Temperature Sensor". It IS plugged into the sensor, which is attached to the firewall by one of the studs on the C100 connector. #2 is fine the way it is. You have the correct connector on it, the wire colors are correct
What did YOU contribute to this guy's inquiry, Mr. "Tech Contributor"?
BTW, WTF does "Tech Contributor" mean?
I forgot we aren't allowed to joke around on this forum.
I gave him solid advice, the same that I have seen regurgitated on this forum a thousand times. Believe it or not the answer is probably actually in the FSM.....
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
Originally Posted by ihatebarkingdogs
Ambient Temperature Override Switch is an input to the Instrument Cluster. Its wire and location is in the Instrument Cluster section of the FSM. There is no description of its function in the FSM, nor have I ever heard anyone reference or mention this sensor in the 35 years I've been messing with C4s. I knew about it when it came up in the OP's picture from years of browsing the FSMs. I'm not exactly sure what it does, but I have a hunch it slows down the LCD update rate in cold temperatures. LCDs get sluggish at cold temps.
That makes two of us. I was looking through the 84 FSM and didn't see anything on function which makes me wonder. I have NEVER heard of that sensor even mentioned in the 27 years of me playing with 82-84 CFI. Now it makes me want to research it just to know.
Wiring - What do these go to
