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I managed to jack somethin up. >:|
#1412271 Tue Jun 01 2021 08:13 PM
Joined: Jan 2020
Posts: 473
P
'Bolter
No clue how it happened, I went to start my truck yesterday, and started to see smoke on the driver's side, and it was
fighting me to start. Somehow, I've managed to melt my brown alternator wire. frown

I have not had one single problem with my wiring. The only thing I can think of is, when I put my new speedometer the other day, maybe a wire got pinched up in the dash or something. I'm going to dive into it after work today, but man that really annoyed me.


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869
Re: I managed to jack somethin up. >:|
pan3lman #1412290 Tue Jun 01 2021 09:45 PM
Joined: Jan 2020
Posts: 473
P
'Bolter
I went out and pulled the fuse block from the firewall, and 2 wires, next to each other, have had the jacket on them completely burned off. They are:

1. the brown wire returning to the fuse block from the alternator, and
2. the brown wire going to/from the accessory ignition terminal on the ignition

I will be ordering a new harness, but my question is, how could I have prevented this? I have the original groundstrap going from the cab to the transmission housing, and I have another 10 gauge wire going from the starter over to the actual frame rail. I had not had any issues with things set up this way. Should I add additional grounds? And if so, can you tell me from/to locations? Man this stinks.


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869
Re: I managed to jack somethin up. >:|
pan3lman #1412297 Tue Jun 01 2021 10:25 PM
Joined: Apr 2005
Posts: 9,901
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Such occurrences are a real concern for the antique vehicle community. A 64 year old truck has been exposed to all sorts of weather conditions and of course critters that like to chew on wiring. Heat deteriorates wiring insulation and just moving the wire to get to something else can cause the insulation to fall off. Could you have done something to prevent this from happening? Probably not given where the short was located. Count yourself lucky that it happened while you were there instead of in the dead of night when you were awakened by the fire truck sirens. As you have figured out, a new wiring harness is in order. You got this!


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2) “Emily”
‘39 Dodge Businessmans Coupe “Clarence”



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Re: I managed to jack somethin up. >:|
pan3lman #1412301 Tue Jun 01 2021 11:19 PM
Joined: Jul 2000
Posts: 1,273
G
Insomniac
I read some of your earlier posts.

Looks like you have a V8 with automatic transmission and a (new?) Speedway wiring harness. Recently, you have been working on the brake light. The truck was was running fine until you wired up the brake light and now you have burnt wires. Most drivers put their foot on the brake when starting the vehicle so I suspect the brake light is shorted out.

Does that make sense?


Gord
----
1954 1/2 ton 235 4 speed
Re: I managed to jack somethin up. >:|
pan3lman #1412302 Tue Jun 01 2021 11:25 PM
Joined: May 2005
Posts: 8,245
B
Sir Searchalot
This may be a moot point or your question does not need an answer since a new harness is going in.... but....without reading all your posts to see what you have done:
1. I see you have a 350 installed.
2. A "brown wire" or brown wires, tells us nothing about where each end goes. Colors get changed and if you have installed an alternator, we don't know what the brown wire does. There is a sensing wire and a exciter wire.
3. Don't understand this: "the brown wire going to/from the accessory ignition terminal on the ignition" .
4. Like I said, does not matter now probably. Keep in mind for future questions. Wiring is a very specific item. It has "to-from" as it is called. Each "TO" and each "FROM" must be fully identified by it's component and the components terminal number or name. I.E. Ignition switch ACC terminal.
5. Consider buying a universal pre-wired fuse panel type harness. The ones where you mount the fuse panel on the inside of cab, on the upper left hood hinge bolts. Take out all wiring intact if you can. Take off all firewall fuse blocks. Don't throw any of it away. Removing the steering wheel is a good thing to do. The overall process is a great DIY project. I've done many TF's. Don't know what electrical gauges you have. The harness kits don't support ammeters, so dump it.


Adding grounds? The wires fried because something got grounded. Your grounds seem OK smile

Last edited by bartamos; Tue Jun 01 2021 11:50 PM.

Watch out for careful drivers!!!
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Re: I managed to jack somethin up. >:|
Justhorsenround #1412305 Tue Jun 01 2021 11:42 PM
Joined: Jan 2020
Posts: 473
P
'Bolter
Originally Posted by Justhorsenround
Such occurrences are a real concern for the antique vehicle community. A 64 year old truck has been exposed to all sorts of weather conditions and of course critters that like to chew on wiring. Heat deteriorates wiring insulation and just moving the wire to get to something else can cause the insulation to fall off. Could you have done something to prevent this from happening? Probably not given where the short was located. Count yourself lucky that it happened while you were there instead of in the dead of night when you were awakened by the fire truck sirens. As you have figured out, a new wiring harness is in order. You got this!
Man you aren't kiddin' on having it happen at home! The sad part on this is, it was a universal harness. The original one for this truck was long gone. That's why I'm trying do what I know best on this truck, but the grounds ALWAYS seem to be the unknown factory for me. Thought I had them covered this time, so I'm at a bit of a loss on what happened.


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869
Re: I managed to jack somethin up. >:|
Gord&Fran #1412306 Tue Jun 01 2021 11:44 PM
Joined: Jan 2020
Posts: 473
P
'Bolter
Originally Posted by Gord&Fran
I read some of your earlier posts.

Looks like you have a V8 with automatic transmission and a (new?) Speedway wiring harness. Recently, you have been working on the brake light. The truck was was running fine until you wired up the brake light and now you have burnt wires. Most drivers put their foot on the brake when starting the vehicle so I suspect the brake light is shorted out.

Does that make sense?
Thanks! Yep, I follow the logic that you have laid out, but I had not even gotten to hooking up the brake lights to anything with power just yet. I was just waiting for the new brake light switch to show up so I could go to that next.

All that was hooked up was the basic wire components to the engine, and a tach. Everything had been fine otherwise.


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869
Re: I managed to jack somethin up. >:|
bartamos #1412309 Tue Jun 01 2021 11:45 PM
Joined: Jan 2020
Posts: 473
P
'Bolter
Originally Posted by bartamos
This may be a moot point or your question does not need an answer since a new harness is going in.... but....without reading all your posts to see what you have done:
1. I see you have a 350 installed.
2. A "brown wire" or brown wires, tells us nothing about where each end goes. Colors get changed and if you have installed an alternator, we don't know what the brown wire does. There is a sensing wire and a exciter wire.
3. Don't understand this: "the brown wire going to/from the accessory ignition terminal on the ignition" .
4. Like I said, does not matter now probably. Keep in mind for future questions. Wiring is a very specific item. It has "to-from" as it is called. Each "TO" and each "FROM" must be fully identified by it's component and the components terminal number or name. I.E. Ignition switch ACC terminal.
5. Consider buying a universal pre-wired fuse panel type harness. The ones where you mount the fuse panel on the inside of cab, on the upper left hood hinge bolts. Take out all wiring intact if you can. Take off all firewall fuse blocks. Don't throw any of it away. Removing the steering wheel is a good thing to do. The overall process is a great DIY project. I've done many TF's. Don't know what electrical gauges you have. The harness kits don't support ammeters, so dump it.


Adding grounds? The wires fried because something got grounded. Your grounds seem OK smile
Thanks for the info. Yep, it's a 350. I'll ask more questions before I try to install harness #2.


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869
Re: I managed to jack somethin up. >:|
pan3lman #1412419 Wed Jun 02 2021 08:34 PM
Joined: Jan 2000
Posts: 565
D
'Bolter
the same thing happened to me once. The speedometer cable shield is grounded. In my case, I somehow got the speedometer cable touching a 12V source, I think it may have been the ammeter terminal. In any case, after taking care with the routing of the speedometer cable it never happened again.
don

Re: I managed to jack somethin up. >:|
pan3lman #1412443 Thu Jun 03 2021 12:54 AM
Joined: Jan 2020
Posts: 473
P
'Bolter
Thanks all for your input!

Long story short, I managed to pinch the brown wire coming off of the 2 prong connector (tab 2) of the alternator. It ran down the passenger side of the engine, and got pinched by the starter and my ground wires. I never even saw it down there when I was recently updating my ground wire connection.

HRL was key in helping to isolate the issue. You guys are the best!!!


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869

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