Ground understanding

[Mario Keller]

Can someone explain to me how the electrical system on a b- body works, please?
I ask myself for example how the fuel sender is working. I have one cable going to the sender. There is no ground connection.
Is that correct?
Then I thought about the rest of my wiring harness. I just threw it in after paint. I don't remember any grounding points. Is that correct? I appreciate any help. I am from Germany and this 69 B-body is my first Mopar.

 

[MoparLeo]

The cluster is the ground.
https://www.e-bodies.org/videos/

 

[Kern Dog]

The fuel sender gets grounded by a clip on strap that connects the fuel line to the nipple on the sending unit. The fuel line is clipped to the body in several places.

 

[kiwigtx]

The fuel sender gets grounded by a clip on strap that connects the fuel line to the nipple on the sending unit. The fuel line is clipped to the body in several places.

...and that is why it is important to make sure the paint is scraped away for that grounding strap after a fresh paint-job.

Many people forget, and the ground strap becomes ineffective.

 

[kiwigtx]

Can someone explain to me how the electrical system on a b- body works, please?

12 Volt negative earth (ground) system. All switches and circuits are initially fed by a 12 Volt positive supply, and the path to ground is through a resistor - whether that be a lamp (bulb for the non-electricians out there), or a heater element, resistor, or gauge resistor.

Some circuits have multiple grounds....as in the courtesy light on the ceiling - door switches and headlight switch....etc

 

[Mario Keller]

What is the grounding strap? Do you have a picture of that?

 

[kiwigtx]

What is the grounding strap? Do you have a picture of that?

Clips between the fuel tank sender and the solid fuel line - jumps across the flexible rubber hose joint.

 

[yella71]

On mopar cars of this vintage the body IS the ground. The fuel sender is the ground for the gauge to work. the tank sending unit must be grounded to the body somehow to complete the circuit.

 

[Don Frelier]

If you cant find a sending unit ground strap, you can use a the copper ground wire out of house wiring and a hose clamp on either side of the rubber hose connection.

 

[JimKueneman]

The new reproduction straps suck. They have the spring steel is cheap. Once stretched to go over the line they don't have much tension to grab into it. if it is a car that never sees weather then you can use it and then pinch the ends with pliers to make it work. If it is a driver and will see the weather I would put a wire over to some screw on the body. Or find an orginal.

 

[Nacho-RT74]

My Charger has worked FOR YEARS without the ground strap at sender unit and never missed a reading. I just added for correctness. The gas tank straps already makes the ground actually.

 

[Nacho-RT74]

The new reproduction straps suck. They have the spring steel is cheap. Once stretched to go over the line they don't have much tension to grab into it. if it is a car that never sees weather then you can use it and then pinch the ends with pliers to make it work.

agreed... it doesn't catch it like a spring, but keeps open when installed