Here I sit waiting on a tow truck. - Diesel Forum - TheDieselStop.com
7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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post #1 of 23 (permalink) Old 01-08-2019, 08:05 PM Thread Starter
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Here I sit waiting on a tow truck.

With fire extinguisher in hand I'm wondering why my grounds for my motor burst into flame. Can anyone help me? Or has this happen to anyone?

90 f350 2wd 7.3idi non T 5speed
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post #2 of 23 (permalink) Old 01-08-2019, 08:34 PM
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Loose grounds and grease equal heat and then fire.

96 F250 PS XLT 4X4 long box, 5sp,4.10, manual hubs,pyro+boost guages, Dark Toumaline, add a leaf, Dale's TYMAR, and HX hose, downpipe, coolant filter, Luk clutch
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post #3 of 23 (permalink) Old 01-08-2019, 09:31 PM Thread Starter
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ok so the ground on the bottom of the motor did not burn just the one from the battery on driver side to front by radiator and the two from the back of motor to the firewall. does that change anything?
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post #4 of 23 (permalink) Old 01-08-2019, 10:09 PM
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I would still suspect a bad connection on the ground.

But if multiple ones burned then I would start looking at a overload problems somewhere

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post #5 of 23 (permalink) Old 01-08-2019, 11:21 PM Thread Starter
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can you give a example?

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post #6 of 23 (permalink) Old 01-09-2019, 09:57 PM
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Electric fuel pump? More lights than the circuit can handle? A high resistance short that isn't bad enough to blow fuses yet? Too big a fuse in a shorted circuit? Air conditiong compressor locking up? Starter solenoid stuck? Shorted battery? The only way you're going to find it is to dig in and start checking.

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post #7 of 23 (permalink) Old 01-09-2019, 11:20 PM
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I am no electrical expert but from what you describe I would think there was alot of amperage involved and not many things could create that draw or short. Those grounds are each larger gauge wires, aren’t they? If the short was from an accessory then I would think the smaller wiring specific to the accessory would have melted or blown a fusible link or a fuse before you saw enough continued amperage to heat up and start a fire through a larger gauge ground.
As was stated above, an overload.

Have you looked at your fuse panel? Can you shine a light into the back of the panel?

Do all of your accessories still function properly?


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2002 F-250 4x4 CC SB 7.3 PSD w/4R100. 182,000 miles.
NOS Black CPS. ScanGauge-II, AIC, Bilstein 5100, Stancor GPR, Marinco Mod, B&W Turnover Ball, Michelin Defender LTX


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2002 F-250 4x4 SC LB 7.3 PSD w/ZF-6. 177,000 miles.
NOS Black CPS. ScanGauge-II. Bilstein 5100. Stancor GPR. Walker BTM. Noco Mod. Michelin Defender LTX 285/75/16.

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post #8 of 23 (permalink) Old 01-10-2019, 08:06 AM
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12v is the most fire prone voltage, add the fact it is DC.

Grounds need to be clean, tight and well secured from becoming lose.

So start from there, check the wiring run from the starter to both the + terminals, ensure no chaffing of the wire and that all connections are clean and torqued.

Do the same for the grounds, then start looking at other places. A little resistance makes big heat when dealing with low voltage I^2R = heat in watts

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post #9 of 23 (permalink) Old 01-11-2019, 12:23 AM Thread Starter
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Thank you all for your help. The starter was acting up the day before and day the fire happen so does that mean it caused it?

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post #10 of 23 (permalink) Old 01-11-2019, 06:10 AM
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Quote:
Originally Posted by DevilDog6154 View Post
Thank you all for your help. The starter was acting up the day before and day the fire happen so does that mean it caused it?
The starter would be the type of heavy amperage draw I was thinking of in an earlier post but I don't know if the starter acting up is the cause or just a symptom.

Did the engine actually start when the fire occurred?

Have you inspected the batteries and checked their voltage?

Have you inspected and improved the ground connections yet to both the frame and the starter that were damaged?

Have you attempted to start the truck since this happened? I am not suggesting you attempt to start it, I just wonder if you have tried. I would inspect the starter before attempting to supply power to it again.

I hate to speculate without you first doing a further visual inspection of the starter but my dad reminded me of a starter on an old tractor that failed to disengage many years ago and the engine rpm kept rotating the starter and it burned up. He remembers the starter actually became a generator and produced current. This back amperage then started burning up wiring. (Fortunately there is not much wiring on those... Lol
It was an old WD45 with its original 6v converted to a 12v but the problem was it was a push button type starter. The push button had either corroded or maybe had ice build up and remained pushed in rather than springing back out once the engine turned over.

I guess it would be possible for this to have happened with your starter if the solenoid stayed engaged.


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2002 F-250 4x4 CC SB 7.3 PSD w/4R100. 182,000 miles.
NOS Black CPS. ScanGauge-II, AIC, Bilstein 5100, Stancor GPR, Marinco Mod, B&W Turnover Ball, Michelin Defender LTX


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2002 F-250 4x4 SC LB 7.3 PSD w/ZF-6. 177,000 miles.
NOS Black CPS. ScanGauge-II. Bilstein 5100. Stancor GPR. Walker BTM. Noco Mod. Michelin Defender LTX 285/75/16.

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2000 F-250 4x4 SC SB 7.3 PSD w/4R100. 164,000 miles.
NOS Black CPS. Rebuilt Fuel bowl w/gold spring, 6.0 Cooler, Walker BTM, Stancor GPR, Michelin LTX M&S2.

Last edited by ArcticDriver; 01-11-2019 at 06:47 AM.
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post #11 of 23 (permalink) Old 01-12-2019, 12:12 AM Thread Starter
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The motor was running when it happen even after the power loss. The only reason the motor shut off was cause my foot come off the clutch pedal. No I haven't check anything it's at a friend's shop so he can do the assessment for the insurance.

90 f350 2wd 7.3idi non T 5speed
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post #12 of 23 (permalink) Old 01-12-2019, 04:12 AM
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I hope you will let us know the results.
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2002 F-250 4x4 CC SB 7.3 PSD w/4R100. 182,000 miles.
NOS Black CPS. ScanGauge-II, AIC, Bilstein 5100, Stancor GPR, Marinco Mod, B&W Turnover Ball, Michelin Defender LTX


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2002 F-250 4x4 SC LB 7.3 PSD w/ZF-6. 177,000 miles.
NOS Black CPS. ScanGauge-II. Bilstein 5100. Stancor GPR. Walker BTM. Noco Mod. Michelin Defender LTX 285/75/16.

SOLD:
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2000 F-250 4x4 SC SB 7.3 PSD w/4R100. 164,000 miles.
NOS Black CPS. Rebuilt Fuel bowl w/gold spring, 6.0 Cooler, Walker BTM, Stancor GPR, Michelin LTX M&S2.
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post #13 of 23 (permalink) Old 01-13-2019, 10:29 AM Thread Starter
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yea i will soon as i know.

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post #14 of 23 (permalink) Old 01-30-2019, 01:38 AM Thread Starter
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so i got my truck back, now i need a new wiring harness for it. does anyone know where i might find one?

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post #15 of 23 (permalink) Old 01-30-2019, 09:12 AM
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