To get a positive you can go straight from the battery or the fuse box. To ground the CB you should ground it to the body being sure you have a connection to bare metal. A better way is to run a cable, along withe the positive side, directly to the battery. If you run power or ground to the fuse box and a short occurs, you may knock out important systems on the vehicle. Best go directly to the battery, with in-line fuses on both sides of the line.
On American cars the positive lead from your cigarette lighter is in the center of your socket. The adapter plug has the positive lead on the tip of the adapter and the negative lead on the side of the adapter. You need to use a volt-ohm meter to find out which wire comes from each lead. (You may be able to open the adapter and follow the wires that way).On the c.b. radio the positive lead should be red. This will connect to the positive lead on the adapter. The black lead on the c.b. radio is the negative lead. This will attach to the negative lead on the adapter.P.S. Usually the adapter will have a fuse built into it to protect from incorrect wiring.
Your coil has a positive and negative side and if there is no power to the positive side you will not have any spark: However, if you have no ground to the negative side you will have the same problem. Check for power and ground with a volt meter.To check for power, connect red lead from volt meter to positive side of coil and black lead to negative side of battery, you should read 12 volts with key on. To check ground, connect black lead from volt meter to negative side of coil and red lead to positive side of battery, you should read 12 volts with key on.
Chassis Ground is your entire vehicle metal structure. The negative side of all electronic components and controls (radio, ignition, lights, etc.) are connected to this structure (frame). The Battery has a black and red cable. The black cable (negative lead or cable) is bolted to this structure creating the Ground. This is called a Negative Ground System. The positive (red cable from battery) is the supply voltage to all these components. The Ground (black and Chassis of the vehicle) is how the voltage returns to the battery.
You'll need a 12 V lead from your fuse box or battery, A good ground, a lead off of your dimmer switch (if you want the tach to light up and be adjustable via dimmer) and then you'll need a lead off of your coil, ( center of your distributor cap to the passenger side) I can't remember for sure if its the positive or the negative, but I am almost positive it was the negative. Try both, it won't hurt anything if you have the lead wrong.
Wiring problems can be time consuming, but the only way to accurately pin-point a problem is to start with the obvious and go from there. I would first do a "bench test" on both radios. Run a positive wire lead,( red wire on radio ), direct to the positive battery post, and a negative wire lead, (black wire on radio), to the negative battery post. This will confirm that the radios are working. If they work, and the radio fuse in the car's fuse panel is good, you probably have a poor ground, which is the black wire coming out of the radio. Try routing the black wire to the chasis or unpainted area on the body. If this still doesn't bring your radio to life, re-route the red positive lead coming out of the radio to another location in the fuse panel,ie.(windshield wiper, heater). Depending on where you route the positive lead, you may get unwanted whistling or wherling noise through your speakers.You also might have to manually shut your radio off everytime you shut the car off, depending on what fuse you use. Just keep trying. Good luck.
How do you get 1000000 robux for free?
Is it true that one human year is equal to seven dog years?
How do you spell water with 3 letters?
What is a narcissist?
What is half of 5000?
What is Sean Connery's shoe size?
How much did George Foreman bench press?
How did chickenpox get its name?
What is doomscrolling?
How did the Wiffle Ball get its name?
Do schools still teach cursive writing?
Can eggs break inside a chicken?
Why do books come out in hardback first?
What happens when a beehive gets too full?
What is the difference between an optometrist and an ophthalmologist?
Is Quentin Somerville related to Julia Sommerville?
Which of the following statements is true about storing classified documents?
What is the meter of manang biday?
Ano ang kahulugan ng iskolarling pagpapahayag?
What happened to Little Juan Burritos?
What is meant by a frequency response curve of an acceptor circuit?
What two generalization can be made about North America at the time of European discovery?