Hey everyone I have a 1973 century and I can't seem to get a spark no matter what I do. I've swapped out spark plugs, wires, ignition coil, distributor cap, and rotor, and still can't get a spark.
I also used a multi meter and tested the battery and ignition coil. They were fine as well... I'm completely lost and it'* feeling like im at a dead end.
Video- https://www.youtube.com/watch?v=k1mCp0KqxcQ

Welcome to the forums.
Do you have the 5.7 (350) or the 7.5 (455) motor?
One thing comes to mind though, that the fuseable link may need to be replaced.
I know you mentioned cap & rotor, just want to make sure this is not a points ignition car.
Luckily we have some experienced members in here that will be more familiar than I am with the 73 century. Hopefully they will chime in soon.

I'm not sure 350 I think

Verify you are getting voltage TO the ignition coil.

I did and it checked out

Couldn't trust my old memory so I had to google to find out when GM went to the HEI distributor, looks like they started in 74 with all models getting them in 75. Soft Ride was on the money to inquire if you had a points style distributor. I assume you do as you mentioned in your original post that you replaced the cap and coil as separate items whereas I believe with HEI the coil is integral with the cap. Some things for a points style distributor for you to check, first spread the points apart to make sure that arcing hasn't destroyed one of the contacts, you may want at least file them or replace the points as well as the condenser. I've never had a condenser go bad, but they're cheap enough to replace. Also there is a short black ground wire secured to the edge of the inside of the distributor, make sure that'* tight, I've had one of those come loose and cause a misfire. If you end up replacing the points, it'* easier and more accurate to set the gap with a dwell meter if you have access to one than using a feeler gauge. Good luck!

Kendrwil, thought of one other thing, if you do replace the points, get the AC-Delco uniset which has the points and condenser in one integral unit, it eliminates the need for the 2 piece aluminum shield that was used to prevent radio interference with windshield antennas. If your distributor has been replaced with a HEI, disregard my posts and my apologies for rambling on.

I'm not sure but I have a video that may help of me under the hood and I plan on uploading more just in case I passed over something

From the video, see that little hatch on the cap that'* about an inch square? It is used primarily to allow water to enter the distributor when the fan is blowing the rain and puddles in, but it is also for setting the dwell . . . on a points distributor. So it'* not HEI.

Whether it is a 350 or a 455 it is otherwise the same setup, however:

Also from the video, it has a 2-barrel carburetor on it . . . which in the Buicks was only available on the 350 in 1973 (unless something terrible has been done to this car like downsizing the carb). They didn't start the 455 2-barrel baloney until 1976 or maybe 1975.

It also looks like a 350 from the span between the pulleys and the shroud. You can get a better "for sure" idea by checking the air cleaner lid, under the dust. I'm going to call it a 350 for now.

Now that we know this much about it, we can diagnose more easily. Check the dwell adjustment. The first thing I'd do is have someone turn the engine over while looking at the distributor with the cap off. See if the points are separating when the cam comes around. If not, adjust with the little allen screw on the side facing where the access port on the cap would be. If it never separates, the condenser will never build a charge.

Moved from "Classics (Star Chief and 1957 to 1986) / Converse about your Classic Bonneville" forum to the "Buick" forum