Notices
1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck
Sponsored by:
Sponsored by: Moser

Positive Ground on 77? HELP!

Thread Tools
 
Search this Thread
 
Old Apr 28, 2016 | 10:55 PM
  #1  
Nathan Kiolbassa's Avatar
Nathan Kiolbassa
Thread Starter
|
New User
Joined: Apr 2016
Posts: 4
Likes: 0
Positive Ground on 77? HELP!

Zzzzzzzzzzz
 

Last edited by Nathan Kiolbassa; Nov 8, 2024 at 01:06 AM.
Reply
Old Apr 29, 2016 | 05:35 AM
  #2  
Blue and White's Avatar
Blue and White
Postmaster
Joined: Nov 2011
Posts: 2,553
Likes: 10
In general positive ground systems went out of production in the 1950's. All dents were made with negative ground... like new cars today. No dent would have been made with positive ground.

In general, a wire from the alternator to the positive side of the battery would be correct for negative ground.

Suggest you start with a volt meter and test the battery first to establish + and - polarity then start checking from there. Any energized power supply wire should show about +12 volts measured against a clean chassis ground or the negative post of the battery.
 
Reply
Old Apr 29, 2016 | 09:07 AM
  #3  
Nathan Kiolbassa's Avatar
Nathan Kiolbassa
Thread Starter
|
New User
Joined: Apr 2016
Posts: 4
Likes: 0
Originally Posted by Blue and White
In general positive ground systems went out of production in the 1950's. All dents were made with negative ground... like new cars today. No dent would have been made with positive ground.

In general, a wire from the alternator to the positive side of the battery would be correct for negative ground.

Suggest you start with a volt meter and test the battery first to establish + and - polarity then start checking from there. Any energized power supply wire should show about +12 volts measured against a clean chassis ground or the negative post of the battery.
That's the thing, when i connected the hot wire from the amplifier to the negative battery and it powered up. Someone definitely converted this and I'm kind of in pickle as how to undo do it.
 
Reply
Old Apr 29, 2016 | 12:54 PM
  #4  
NumberDummy's Avatar
NumberDummy
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
Club FTE Gold Member
6V positive ground: 1955 and earlier / 12V negative ground: 1956 thru today.
 
Reply
Old Apr 29, 2016 | 01:33 PM
  #5  
jas88's Avatar
jas88
Lead Driver
20 Year Member
Joined: Feb 2002
Posts: 7,961
Likes: 594
From: Greater Austin, Texas
Club FTE Silver Member

The first thing I would do is check polarity on the battery with a volt meter.
 
Reply
Old Apr 29, 2016 | 01:55 PM
  #6  
J ballan's Avatar
J ballan
Fleet Mechanic
Joined: Jan 2012
Posts: 1,668
Likes: 13
From: Saskatchewan
I've been told a if a normal 12v battery gets dead enough it's possible to charge it back up with reverse polarity although it never seen it. This would explain your current set up.
 
Reply
Old Apr 29, 2016 | 02:49 PM
  #7  
hasteranger's Avatar
hasteranger
Lead Driver
Joined: Mar 2010
Posts: 5,250
Likes: 11
From: West Virginia
I'd check the ignition. It won't work with polarity reversed. If its not reversed there, then it's not reversed.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Bazookajoe
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
18
Jul 27, 2015 08:35 AM
old broke prospector
1961 - 1966 F-100 & Larger F-Series Trucks
0
Apr 9, 2013 07:43 AM
james G. phillips
1948 - 1956 F1, F100 & Larger F-Series Trucks
5
Jul 17, 2008 05:16 PM
oft
Electrical Systems/Wiring
21
Mar 13, 2007 12:43 AM
red89F150
Electrical Systems/Wiring
8
Feb 14, 2006 10:33 PM




All times are GMT -5. The time now is 07:22 PM.

story-0
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-1
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 15:43:58


VIEW MORE
story-2
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-06-03 11:38:36


VIEW MORE
story-3
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-4
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE
story-5
Top 10 Ford Truck Tragedies

Slideshow: Top 10 Ford truck tragedies.

By Joe Kucinski | 2026-05-18 19:34:33


VIEW MORE
story-6
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

And it might be even better than that.

By Brett Foote | 2026-05-18 19:26:42


VIEW MORE
story-7
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Slideshow: Does lowering an F-150 Lobo RUIN the ride quality?

By Michael S. Palmer | 2026-05-18 19:20:37


VIEW MORE
story-8
Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Slideshow: Ford's bizarre fishing-themed Explorer concept has resurfaced after spending decades largely forgotten.

By Verdad Gallardo | 2026-05-12 18:07:46


VIEW MORE
story-9
10 Best Ford Truck Engines We Miss the Most!

Slideshow: The 10 best Ford truck engines we miss the most.

By Joe Kucinski | 2026-05-12 13:09:47


VIEW MORE