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Winter is Coming
Time to think about wintering your Bolt.
(continued)

A good Tech Tip
WINTERIZING YOUR TRUCK
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1950 FC253 #1469422 Mon Oct 03 2022 06:36 PM
Joined: Jul 2022
Posts: 28
1
'50 GMC 1 Ton Dually - Barn Find (sort of...no barn)
are you saying that this vehicle is Positive Ground ?...the wiring diagram I have seems to indicate that it is Negative Ground

1950 FC253 #1469424 Mon Oct 03 2022 07:04 PM
Joined: Jun 2011
Posts: 4,655
E
'Bolter
GMC used pos. ground for many years, ‘til ‘55 at least. Need tone switched.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
1950 FC253 #1469425 Mon Oct 03 2022 07:08 PM
Joined: Jul 2022
Posts: 28
1
'50 GMC 1 Ton Dually - Barn Find (sort of...no barn)
wow...feeling dumb now...how can I tell if it is Pos or Neg Ground ?...what do you mean by "Need tone switched" ??

1950 FC253 #1469427 Mon Oct 03 2022 07:20 PM
Joined: Oct 2021
Posts: 1,163
O
'Bolter
Which battery cable is connected to the starter and which one is connected to the frame (ground)?


1939 Packard Standard Eight Coupe (The Phantom)
1950 Chevrolet 3100 (Ol' Roy)
1956 Cadillac Coupe de Ville (The Bismarck)
1966 Oldsmobile Toronado (The Purple Knif)
1966 Ford Mustang (Little Red)
1964 Ford Galaxie 500 coupe
1979 Ford F-100
1976 Ford F-150 (Big Red)
1995 Ford F-150 (Newt)
1950 FC253 #1469443 Mon Oct 03 2022 08:51 PM
Joined: May 2005
Posts: 9,098
B
Sir Searchalot
Whatever it is........ or was.............make it negative ground. See tech tip. Easy as pie. Piece of cake.





1950 FC253 #1469470 Tue Oct 04 2022 12:40 AM
Joined: Jun 2011
Posts: 4,655
E
'Bolter
Hook battery ground to frame or engine bolt by starter. Battery plus to starter lead!

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
1950 FC253 #1469476 Tue Oct 04 2022 02:12 AM
Joined: Jan 2022
Posts: 409
B
'Bolter
Originally Posted by 1950 FC253
are you saying that this vehicle is Positive Ground ?...the wiring diagram I have seems to indicate that it is Negative Ground

It was positive ground when it left the factory 72 years ago.

1950 FC253 #1469477 Tue Oct 04 2022 02:20 AM
Joined: Jul 2022
Posts: 28
1
'50 GMC 1 Ton Dually - Barn Find (sort of...no barn)
it is Positive Ground now...i.e. Positive/Red/+ Battery Cable to Starter Terminal...Negative/Black/- Battery Cable to Ground. This truck has had some serious "tinkering" prior to my getting it...lots of extra wires...some going to nowhere...toggle switches (from the 80's) added to the dash (no wires)...etc. will proceed with getting Ignition Resistor and trying the 12v start...fingers crossed

1950 FC253 #1469501 Tue Oct 04 2022 02:37 PM
Joined: Jan 2022
Posts: 409
B
'Bolter
Originally Posted by 1950 FC253
it is Positive Ground now...i.e. Positive/Red/+ Battery Cable to Starter Terminal...Negative/Black/- Battery Cable to Ground.

You said "Negative battery cable to ground". Sounds like it has been converted to negative ground to me.

Color of the cable makes no difference.

1950 FC253 #1469502 Tue Oct 04 2022 02:37 PM
Joined: May 2005
Posts: 9,098
B
Sir Searchalot
Originally Posted by 1950 FC253
it is Positive Ground now...i.e. Positive/Red/+ Battery Cable to Starter Terminal...Negative/Black/- Battery Cable to Ground. This truck has had some serious "tinkering" prior to my getting it...lots of extra wires...some going to nowhere...toggle switches (from the 80's) added to the dash (no wires)...etc. will proceed with getting Ignition Resistor and trying the 12v start...fingers crossed

You need to understand what positive ground means. It means the positive/red/battery (+) cable is attached to a ground. Ground is the chassis metal.
You have said you have "Positive ground now"....but you have described negative ground.





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