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View Full Version : HOW TO test a Ignition Switch?


MinnesotaMuscle
03-30-2009, 08:58 PM
Ok guys, I"m chasing a electrical issue, I'm down to the Ignition Switch. The vehicle doesn't turn over when in the "start" position, and I'm trying to figure out which posts on the switch make contact when in the "start" position??? Anyone?
Local Boy
03-30-2009, 09:58 PM
Test with a volt meter...

ALOHA
MinnesotaMuscle
03-30-2009, 10:22 PM
OK, but what I need to find out is when in the start position, which I accomplish by pulling the slide lever with my hand as if I was cranking it over, what posts should I test for continuity?
Blk Mamba
03-30-2009, 10:34 PM
Ford ignition switches don't go bad, I have a spare to prove it. Mine drove me nuts, I finally had it towed to the dealer, and they replaced the radio static filter, and the knock sensor wiring. Could have fooled me.
Mike M
03-30-2009, 10:51 PM
Just check at the starter to see if it's getting a crank signal.
MinnesotaMuscle
03-30-2009, 11:08 PM
I have and its not... I'm not getting juice to the starter relay even or to fuse #26, next in line is the ignition switch.... I'm getting overwelmed with this... But I'll die before I bring it to my stealership, man I hate those guys....
MinnesotaMuscle
03-30-2009, 11:10 PM
Ford ignition switches don't go bad, I have a spare to prove it. Mine drove me nuts, I finally had it towed to the dealer, and they replaced the radio static filter, and the knock sensor wiring. Could have fooled me.

You wouldn't mind parting with it would you? Just need to plug one in and check.... Don't know how the dealer feels about parts return...
Blk Mamba
03-30-2009, 11:26 PM
I left the new one in when I did it, hot wire the connector, it's cheaper, they aren't that expensive anyway, $12. Duralast PN LS615. The wiring diagram would help, but I don't have one. Mine blew, (i think) fuse #8 also, check it. The no power to the starter was the reason I bought the switch, wasn't it, the problem is between the starter and the switch.
MinnesotaMuscle
03-30-2009, 11:39 PM
hot wire the connector, it's cheaper, they aren't that expensive anyway, $12. Duralast PN LS615.

I'm confused, you mean the relay? I'll run check the fuse..
MinnesotaMuscle
03-30-2009, 11:49 PM
Nope fuse is fine, along with a host of others I checked for the fun of it. I'm going to recheck the power at the starter relay again in the morning when I have someone to turn the key....
Local Boy
03-31-2009, 11:23 AM
Sorry...

I just read your original post...

You did everything I was thinking of...

Good Luck...

ALOHA
MinnesotaMuscle
03-31-2009, 03:44 PM
Thanks for the help so far...
larryo340
04-01-2009, 06:22 PM
This should make it easier:

http://i299.photobucket.com/albums/mm288/larryo340/Tech%20stuff/Marauderignition.jpg
http://i299.photobucket.com/albums/mm288/larryo340/Tech%20stuff/Marauderignition2.jpg
MinnesotaMuscle
04-01-2009, 10:00 PM
WOW, that helps a ton! After about two hours I had half of that mapped out, but htat makes things much easier! Back at it in the AM....
MinnesotaMuscle
04-04-2009, 10:23 AM
Ok, one question, how does the power go from the ignition switch to the underhood fuse box? By looking at the diagram I can only think of two wires, which would be the ONLY two that get power supplied to them when the switch is in the "start" position.

Red/lightblue (STA)
OR
LargeGreen/Violet (I2)

But I can't seem to find them comming into the underhood fuse box.... Anyone have a diagram for the underhood fuse box to figure out which wire it is? Here I thought it would be easy and it would go to one of the three "ignition" fuse's or the "ignition" Relay. But nope, none of the wires matched, and I ran a continuity test from the two wires mentioned above that are supplied power to the fuses/relay and nothing....

now I'm lost again....idea's?
larryo340
04-04-2009, 05:22 PM
Ok, one question, how does the power go from the ignition switch to the underhood fuse box? By looking at the diagram I can only think of two wires, which would be the ONLY two that get power supplied to them when the switch is in the "start" position.

Red/lightblue (STA)
OR
LargeGreen/Violet (I2)

But I can't seem to find them comming into the underhood fuse box.... Anyone have a diagram for the underhood fuse box to figure out which wire it is? Here I thought it would be easy and it would go to one of the three "ignition" fuse's or the "ignition" Relay. But nope, none of the wires matched, and I ran a continuity test from the two wires mentioned above that are supplied power to the fuses/relay and nothing....

now I'm lost again....idea's?

Here's a bunch of reading for you ;):

http://i299.photobucket.com/albums/mm288/larryo340/Tech%20stuff/03MarauderPowerDistribution-1.jpg
http://i299.photobucket.com/albums/mm288/larryo340/Tech%20stuff/03MarauderStartingciruit.jpg

http://i299.photobucket.com/albums/mm288/larryo340/Tech%20stuff/03MarauderCircuitF.jpg

http://i299.photobucket.com/albums/mm288/larryo340/Tech%20stuff/03MarauderCircuitH.jpg

http://i299.photobucket.com/albums/mm288/larryo340/Tech%20stuff/03MarauderCircuitE.jpg
MinnesotaMuscle
04-04-2009, 05:33 PM
WOW, that's some good stuff! Some serous toilet reading right there! Where in the program did you find these, didn't know it possesed them. And yes I have the same one as your using thanks to captin...
larryo340
04-05-2009, 09:16 AM
WOW, that's some good stuff! Some serous toilet reading right there! Where in the program did you find these, didn't know it possesed them. And yes I have the same one as your using thanks to captin...

If you have the factory DVD manual you would find these in the EVTM section, but they are tricky to navigate if you aren't familar with Ford's terminology.