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Old 12-03-2017, 04:34 PM   #1
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Mystery switch #2: in dash to under-chasis

Vehicle is a 2002 E350 7.3L built by SMB Austin. I have a basic toggle in the dash (the silver one) that receives power directly from the under hood fuse block and feeds to what appears to be a wiring harness under the chassis, just near the oil filter. Flipping the switch appears to do nothing as far as i can tell. The load wire is the yellow wire dead center in the photo that shows the oil filter. Any ideas?
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Old 12-03-2017, 04:50 PM   #2
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Option 1:

a. Disconnect all batteries from the system.

b. Attach a tone generator to the wire at the switch end.

c. Crawl around with a tone probe to see where the dang thing goes.

Option 2:
Wait for someone else to come up with a better idea about what the darn thing is.

Have fun...
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Old 12-03-2017, 09:36 PM   #3
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Quote:
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Option 2:
Wait for someone else to come up with a better idea about what the darn thing is.
email Austin?
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Old 12-03-2017, 09:59 PM   #4
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Ejector seat, just be glad it was disabled.
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Old 12-03-2017, 10:24 PM   #5
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Ejector seat, just be glad it was disabled.

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Old 12-04-2017, 06:37 AM   #6
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Do you have a on board air compressor? Not the locker air compressor but one for airing up tires. That's a heavier duty switch indicating that it possibly feeds or fed something that pulls some higher amps. Then again it could just be what they used back then.
On my van I have:
back up light switch
several off road light switches
air compressor
high idle
backup alarm switch
Stereo amp on/off
Some builds have a valet switch. Some have a master DC cutoff switch SMB used for when the vehicle is stored but those are usually located in the mid section of the vehicle. SMB rarely used a toggle switch on the separator and back then I'd suspect you have a isolator on an 02 unless it was upgraded.
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Old 12-09-2017, 10:06 PM   #7
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@glider...the tone and probe was a great new purchase, and traced the wire quickly. It solved two issues. First, traced the line effectively despite the with changing color at some point in the shroud. It also pointed out where the wire had corroded and broke by recognizing that the volume suddenly dropped. Wire fixed and completed trace back to the trailer power plug. Must have been a switch for extra lights or backup signal on the trailer.

Thx for the feedback.
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Old 12-28-2017, 03:01 PM   #8
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@glider...the tone and probe was a great new purchase, and traced the wire quickly. It solved two issues. First, traced the line effectively despite the with changing color at some point in the shroud. It also pointed out where the wire had corroded and broke by recognizing that the volume suddenly dropped. Wire fixed and completed trace back to the trailer power plug. Must have been a switch for extra lights or backup signal on the trailer.

Thx for the feedback.
Wondering what tone generator and probe you ended up getting. I have a similar wiring problem I need to track down. Thanks.
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Old 12-31-2017, 12:44 PM   #9
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I purchased this one, only because I like the Klein brand.
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Old 12-31-2017, 04:51 PM   #10
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OK, not to hijack but this is the second time I've read about a tone generator TODAY on a forum. I've fooled around with vehicle wiring, stereos and conversions all my life and somehow never heard of this fascinating device. HTH did I miss this? Already added to my Amazon list.

Thanks Glider!

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