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Pre-Power Stroke Diesel (7.3L IDI & 6.9L) Diesel Topics Only

1988 f250 7.3L idi

 
  #1  
Old 02-03-2019, 11:09 PM
Tbrad003
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1988 f250 7.3L idi

Iím having smoke come from my dash and donít really now what it could really be, it smelt electrical but couldnít see any burnt wires from just underneath dash. I donít use heat or anything blower motor has been out of it for while now so didnít think that could be it.
 
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Old 02-03-2019, 11:43 PM
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Pull the radio and take a look.

Once in another vehicle I had the po installed an aftermarket radio and the dimmer wire from the headlight switch which was unused for the new radio, was touching the metal brace..
 
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Old 02-04-2019, 03:49 AM
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Ok I will try that when I get off of work today it does have a after market radio In it and has had subs and a light ran in it.
 
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Old 02-04-2019, 07:30 AM
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You can also check all of your fuses. If there was a short that caused smoking hopefully it blew one of your fuses. If one of your fuses is blown start with that circuit.
 
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Old 02-04-2019, 06:05 PM
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I checked all the fuses and one of my fuses look like it was melting and circuit board may need replaced because of were the fuse melt the slot for it.
 
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Old 02-05-2019, 07:18 AM
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That's no good!

Post a pic when you get a chance.
 
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Old 02-05-2019, 07:46 AM
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Will as soon as I get off today.
 
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Old 02-05-2019, 04:07 PM
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when my 88 did that it was the hot wire that feeds 30 amp fuse that powers the Heater blower,. that main power leg splits in the fuse box and powers 4-5 other fuses.
AC, blower motor, brake lights, and a few other things
 
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Old 02-05-2019, 04:40 PM
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Tjc

So what did you do to fix that? Did you just remove the hot wire? Replace the fuse box? What were your steps to solve it?
 
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Old 02-05-2019, 05:05 PM
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i removed the smoked wire from the fuse box, and soldered in a maxi fuse holder then connected all the other taps to the other end of the maxi holder. it was only supposed to be a temporary fix until i got home, as i was 400 miles away on a wide load escort.
as with most of my other temporary repairs, it became a permanent repair because it never gave me any more problems. 20 years and still holding.
but when i replace the cab i am going to use the wiring harness in the new cab, as it is uncut and all original out of a truck that only had 23,000 miles on it.
the owners son "borrowed" the truck in 91 and hit a tree. the father backed it into the barn and left it there for 21 years.
my friend bought it for the engine and trans and sold me the sheet metal.
 
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Old 02-12-2019, 12:34 PM
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Still smoking

Iíve removed the fuses and replaced the bad ones but the blower moter fuse is obviously to bad of shape to put fuse back in it so I left out and noticed that when Iím turning my lights on itís cause the truck to smoke but I canít locate weíre the smoke is coming from
 
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Old 02-12-2019, 04:15 PM
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Have you checked the plug on the headlight switch?

They're bad about melting and shorting
 
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Old 02-13-2019, 07:04 AM
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I also had a blower motor speed switch melt down. I don't know if it's the rattling cause by the diesel engine or just poor engineering, but the wiring in our trucks strikes me as pathetic.
 
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Old 02-13-2019, 12:36 PM
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Originally Posted by Olds64 View Post
I also had a blower motor speed switch melt down. I don't know if it's the rattling cause by the diesel engine or just poor engineering, but the wiring in our trucks strikes me as pathetic.
The blower motor has excessive current draw and is the cause of the circuit and fuse meltdown. The motor needs to be replaced. I have done the fuse bypass as mentioned by TJC Transport with with good results.
 
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Old 02-22-2019, 12:49 PM
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The Wires seem pretty shot so I am replacing the pigtail switch in the main headlight switch but noticed this green yellow wire as burn all the way up to the wire harness
 

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