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Do I need to ground from the block to the frame if I still have the block to firewall ground up by the master cylinder?
It is my belief that all trucks originally had the ground point as shown in Max's post 9 , photo 3. His photo is of a high quality OEM replacement part.
The thing is battery cables are a common replacement items, and the generic ones skip the frame ground. So it's really rare to see the correct part installed.
Not having the frame ground effects any electrical items attached the the frame. Like the fuel tank sending units or rear lights on the back of the bed. Often these items find alternative ground paths, like though lightbulb filiments. I personally feel the original frame ground shown in post 9 is a must have item
Here is a photo of a stock battery cable negative frame ground connection.
.
And for those folks wondering if I really drove my truck with a stock original negative battery cable that's over 30 years old, all I can say is it still was working fine as is.
It is my belief that all trucks originally had the ground point as shown in Max's post 9 , photo 3. His photo is of a high quality OEM replacement part.
The thing is battery cables are a common replacement items, and the generic ones skip the frame ground. So it's really rare to see the correct part installed.
Not having the frame ground effects any electrical items attached the the frame. Like the fuel tank sending units or rear lights on the back of the bed. Often these items find alternative ground paths, like though lightbulb filiments. I personally feel the original frame ground shown in post 9 is a must have item
Here is a photo of a stock battery cable negative frame ground connection.
.
And for those folks wondering if I really drove my truck with a stock original negative battery cable that's over 30 years old, all I can say is it still was working fine as is.
Jim
Most all of these trucks run a separate ground wire running all the way up front to the firewall on the inside of the cab behind the radio (G701). But like you said it's good practice to ground the frame, I am sure the factory did ground the frame originally.
Most all of these trucks run a separate ground wire running all the way up front to the firewall on the inside of the cab behind the radio (G701). But like you said it's good practice to ground the frame, I am sure the factory did ground the frame originally.
I can tell you both of my 81 F100's, flare side and long bed style side did not have a ground wire from the rear to the firewall behind the radio.
I dont know when they started this wire or if it was on both flare sides and style sides but think guys have said it was on their style side trucks.
Oh both trucks, 300 six motors, had a frame ground from battery on it's way to the top starter bolt.
Dave ----
I can tell you both of my 81 F100's, flare side and long bed style side did not have a ground wire from the rear to the firewall behind the radio.
I dont know when they started this wire or if it was on both flare sides and style sides but think guys have said it was on their style side trucks.
Oh both trucks, 300 six motors, had a frame ground from battery on it's way to the top starter bolt.
Dave ----
That is a 1981 diagram above. Not to say Ford never made mistakes.
