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Old 05-17-2017, 09:08 PM   #1
Zone47
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Angry Smoke and flames from under the dash!



Ok, at least smoke..... the flames weren't too far behind. Holy crap I was freaking out.

Luckily I was able to rip the hot lead off the battery before the flames set in but somehow the key switch decided it was time to short out. You'd think a fuse would blow somewhere.

I pulled the switch out and the connector apart and the purple solenoid wire got melty. I'm not sure how to get the switch further apart but am afraid it is one of those things that will come flying apart and I'll never get it back together.

Can you buy replacement switches (in dash for a 67 or 68)?





Soo... ACC is on top, Solenoid is underneath it, Batt on the right, ground 1 and 2 on the bottom.... and IGN on the left.

Last edited by Zone47; 05-17-2017 at 09:22 PM.
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Old 05-17-2017, 09:13 PM   #2
terry b
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Re: Smoke and flames from under the dash!

Man that is some Scarry stuff. Could have happened anytime. Thank God you were there to take charge.
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Old 05-17-2017, 09:14 PM   #3
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Re: Smoke and flames from under the dash!

Wow!
Were you starting the truck when this occurred?
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Old 05-17-2017, 09:19 PM   #4
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Re: Smoke and flames from under the dash!

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Wow!
Were you starting the truck when this occurred?
Yeah, I started it to back it out of the garage.

The first clue was that the starter wouldn't release even after the engine fired up. I turned it off and tried again, it did the same thing. I tried one more time and then turned the key off and back on real quick which disengaged the starter but let the engine keep running. Then I backed it out and saw all this smoke happening.

So either way I had problems but usually a fire burning the truck up is a bigger problem.
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Old 05-17-2017, 09:32 PM   #5
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Re: Smoke and flames from under the dash!

I would check the switch with a ohm meter and if the start contact is fused I would replace the switch. I have been down the tear it apart and fix it road. It can be done. It is a pain. Parts will want to fly away. And in the end the contacts are damaged and once cleaned up with a file they may not make good contact with each other then you have the opposite problem. I would also check the neutral safety switch, the firewall connectors, and the connection at the solenoid for damage too. If the switch checks out with the meter then you may have a starter issue.

Yes! Burning wires under the dash are a big issue. At least you weren't crossing the traps at 105+ in the dark with no lights except the red glow shining through the smoke from under the dash.
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Old 05-17-2017, 09:42 PM   #6
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Re: Smoke and flames from under the dash!

when you do get it fixed you can add a fusable link so that doesn't hopefully happen again . the purple wire is 12 gauge so use a 6 inch piece of 16 gauge wire at the starter solenoid to the purple wire .
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Old 05-17-2017, 09:50 PM   #7
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Re: Smoke and flames from under the dash!

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Originally Posted by HO455 View Post
I would check the switch with a ohm meter and if the start contact is fused I would replace the switch. I have been down the tear it apart and fix it road. It can be done. It is a pain. Parts will want to fly away. And in the end the contacts are damaged and once cleaned up with a file they may not make good contact with each other then you have the opposite problem. I would also check the neutral safety switch, the firewall connectors, and the connection at the solenoid for damage too. If the switch checks out with the meter then you may have a starter issue.

Yes! Burning wires under the dash are a big issue. At least you weren't crossing the traps at 105+ in the dark with no lights except the red glow shining through the smoke from under the dash.
Thanks, I'll have to dig into it more tomorrow .... I imagine there new switches available, I'm just not sure if they will connect up properly. I might as well dig into the old one first and see what went wrong.

I'd like to find a schematic of the wiring on this truck to see what is supposed to be fused. Things tend to sometimes change over 50 years.

Yeah, it could have been a bad scene.... I mean anywhere down the road it could have happened and I don't normally carry any pressurized fire retardant with me.

Quote:
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when you do get it fixed you can add a fusable link so that doesn't hopefully happen again . the purple wire is 12 gauge so use a 6 inch piece of 16 gauge wire at the starter solenoid to the purple wire .

Thank you, good idea!
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Old 05-17-2017, 10:37 PM   #8
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Re: Smoke and flames from under the dash!

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when you do get it fixed you can add a fusable link so that doesn't hopefully happen again . the purple wire is 12 gauge so use a 6 inch piece of 16 gauge wire at the starter solenoid to the purple wire .
Great idea if you ask me. Congratulations OP, you saved your truck's life.
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Old 05-17-2017, 11:11 PM   #9
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Re: Smoke and flames from under the dash!

Yup.
Fusible link from the battery to the low current side. Been there, fried that...
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Old 05-18-2017, 09:26 AM   #10
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Re: Smoke and flames from under the dash!

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Great idea if you ask me. Congratulations OP, you saved your truck's life.

And quite possibly the garage too.

Fusible links are a good idea.

I bet your thinking you need a fire extinguisher now...do it cheap insurance.
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Old 05-18-2017, 09:33 AM   #11
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Re: Smoke and flames from under the dash!

http://www.ebay.com/itm/Ignition-Sta...pYo1X1&vxp=mtr

pretty cheap to get a new one , for a 72
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Old 05-18-2017, 10:00 AM   #12
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Re: Smoke and flames from under the dash!

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Originally Posted by midniteblues View Post
...I bet your thinking you need a fire extinguisher now ...
Very good idea! One I'm doing today after a bit of a fire scare myself yesterday ( left a grease towel under the hood making contact with the header ).

I'm going to eventually have 3: garage, truck and kitchen.

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Old 05-18-2017, 10:11 AM   #13
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Re: Smoke and flames from under the dash!

Rockauto shows six different brands of a 68 model c10 switch in stock from cheapies all the way up to Ac Delco and Goodmark.

If you like Ac Delco, they have ACDELCO D1406A in stock for 20 dollars.
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Old 05-18-2017, 09:40 PM   #14
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Thumbs up Re: Smoke and flames from under the dash!

Quote:
Originally Posted by 67 chevelle View Post
http://www.ebay.com/itm/Ignition-Sta...pYo1X1&vxp=mtr

pretty cheap to get a new one , for a 72
Wow! Thanks, that's exactly what I have!!!

Quote:
Originally Posted by Tx Firefighter View Post
Rockauto shows six different brands of a 68 model c10 switch in stock from cheapies all the way up to Ac Delco and Goodmark.

If you like Ac Delco, they have ACDELCO D1406A in stock for 20 dollars.
I'll check those too, thanks!
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Old 05-18-2017, 10:15 PM   #15
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Re: Smoke and flames from under the dash!

Lucky for quick action and disconnecting the battery! I'd personally go for an inline fuse, since it is less of a pain to replace if this ever happens again.

Looks like you should change your handle here to FIREBALL.
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Old 05-18-2017, 10:27 PM   #16
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Re: Smoke and flames from under the dash!

inline fuses create resistance over time and usually don't hold up well in a starting circuit due to the current draw and the load comes on so fast . so people tend to oversize them and you end up in the same situation or because of the resistance end up stranded . fusable links are way better and easy to install as a inline fuse
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