Ignition switch problem |
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Ignition switch problem |
watsonrx13 |
Nov 15 2008, 06:59 PM
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#1
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Advanced Member Group: Members Posts: 2,735 Joined: 18-February 03 From: Plant City, FL Member No.: 312 Region Association: South East States |
Last week I swapped out the ignition tumbler then started having electrical problems. I decided this weekend I would try to tackle them. BTW, I have a '74 2.0l FI. Here's the situation:
When I turn the ignition switch on, I don't get any power to the fuse panel nor the fuel pump nor the starter. Before swapping the tumbler, everything was working fine, except the headlights wouldn't raise. They would light up, but not pop up. So, I checked the wiring diagram. Here's my interpretation of the ignition switch..... 30 - power from the battery (red) X - headlight switch (red) 15 - fuse #9 (black) & seat belt warning light (red) P - starter S - seat belt warning w/buzzer(gray/brow) 50 - seat belt warning w/buzzer (yellow) I pulled the tumbler and checked for power at ignition plug #30 - good - 12v When I turn the key, I get power to fuse #9 (12v). Also the seat belt warning light comes on (the one in the dash above the vent controls). When I close the doors, the light doesn't lite up. The seat belt buzzer sounds, but stops when the doors are closed. Looking at the diagram, it appears that there should be power to the red wire at fuse #11. I checked and nothing. I decided to place a wire directly from the battery to the #11 fuse. When I installed this wire, my headlights raised and lit up. The fog lights worked. The windshield wipers worked. The turn signals worked. Is there suppose to be a direct connection between the battery and the fuse panel? And if so, where is the conection? I think the ignition switch is bad, but I swapped out (2) others that I have in my stash, but they didn't work either. Joe has suggested that I remove the ignition switch from the tumbler and use a small screwdriver to turn the switch, which I'll perform tomorrow. Any suggestion? BTW, I don't have internet connection at the shop, so I won't be able to check until tomorrow. -- Rob |
Spoke |
Nov 18 2008, 01:50 PM
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#2
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Jerry Group: Members Posts: 7,052 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None |
The seat belt relay assembly does something with the starter signal to the starter. Power from one of the F10-F12 fuse goes to this assembly. If power is not on the fuses, then the starter will not start.
About the FI fuel pump, do you hear the 2 second startup when you put the key in the RUN position? My guess is that the "no power to fuses 10-12" is causing all your problems. Question: What was happening with your car before you changed the ignition switch? What wasn't working before you changed the ignition switch? |
watsonrx13 |
Nov 18 2008, 04:54 PM
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#3
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Advanced Member Group: Members Posts: 2,735 Joined: 18-February 03 From: Plant City, FL Member No.: 312 Region Association: South East States |
The seat belt relay assembly does something with the starter signal to the starter. Power from one of the F10-F12 fuse goes to this assembly. If power is not on the fuses, then the starter will not start. About the FI fuel pump, do you hear the 2 second startup when you put the key in the RUN position? My guess is that the "no power to fuses 10-12" is causing all your problems. Question: What was happening with your car before you changed the ignition switch? What wasn't working before you changed the ignition switch? I swapped out the igition tumbler... becauseI lost the key.... (IMG:style_emoticons/default/slap.gif) I had been having problems with the headlights raising....The wipers weren't working, so I think I was having problems before the tumbler swap.... Prior to the tumbler swap, I was diagnozing the FI... I was finally able to successfully run the fuel pump and get all of the FI components to work properly. I could hear the 2 second start up before, but not now. The idle was 1200-1500 cold, then 900-1000 warm. I'm going to do some more testing of the circuits tomorrow, so stay tuned and thanks again for the suggestions... -- Rob |
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