Hot ignition key E350
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Elder User
Joined: Oct 2011
Posts: 605
Likes: 1
From: Castle Rock, CO
Hot ignition key E350
Hi- I know this is the forum for the dentsides but I thought I might try getting an answer from you experts on a E350. I just bought a 78 Class C Mitchell motorhome built on an E350 Ford van chassis. 46K miles, 460 V8, ignition is in the dash like my 74 F350 . I noticed while driving it home from the prior owners, that the ignition key was VERY HOT. This was after approximately 30 minutes of driving. Starts and runs fine otherwise. I am assuming that this is not "normal"? Has anyone experienced this and any thoughts regarding a fix?
Thanks in advance for your help!
Thanks in advance for your help!
Senior User
Joined: Jul 2003
Posts: 425
Likes: 3
My guess is that you have a short in your ignition switch that is causing the key to heat up. Feel the switch itself up under the dash and I'll bet the whole thing is hot. If that is the case then replace it before you have a complete meltdown.
The other possibility is that your defroster is on and has a hole in the ducting that is blowing down on your switch...
The other possibility is that your defroster is on and has a hole in the ducting that is blowing down on your switch...
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Agreed, sounds like a short in the switch. You'll want to test continuity between each switch terminal and the switch body in each position. The only terminal that should have continuity with the switch body is the PROVE-OUT terminal (leads to the PURPLE with WHITE stripe wire). You'll also want to inspect the switch pigtail to make sure the wiring going into the switch has not burned up.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
Pull the wiring harness plug down to where you can see it. Look carefully at the terminals and be sure they are all clean and free of corrosion. If you find any, clean the terminals well before installing the new switch.
Corrosion causes resistance which causes heat, you can pretty much figure out the rest.
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Elder User
Joined: Oct 2011
Posts: 605
Likes: 1
From: Castle Rock, CO
If you replace the switch, don't just plug in the new one.
Pull the wiring harness plug down to where you can see it. Look carefully at the terminals and be sure they are all clean and free of corrosion. If you find any, clean the terminals well before installing the new switch.
Corrosion causes resistance which causes heat, you can pretty much figure out the rest.
Pull the wiring harness plug down to where you can see it. Look carefully at the terminals and be sure they are all clean and free of corrosion. If you find any, clean the terminals well before installing the new switch.
Corrosion causes resistance which causes heat, you can pretty much figure out the rest.
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