No spark and i can only get 5V at the coil.
UPDATE: I just realized the electrical diagrams were in the body service manual instead of the chassis service manual so im looking at those now.
Thank you VERY much for resizing. No the main diagrams are not in the body manual. Those are only partial diagrams for stuff like tail light harness etc
OK let's make some tests. Think of the ignition as "it's own little world." Let's do some tests without the car. In other words, you should be able to "in imagination" lay the ignition out on a bench and test it.
First, some basics.
Inspect the cap and rotor, look for dirt, moisture, debri, and spark "punch through" or so called "carbon tracking."
Take your ohmmeter and check continuity (for now) of the coil wire. Shake it around.
UNHOOK anything on the coil EXCEPT the power wire from the ballast to the POS and the ECU wire from the ECU
Unhook any radio caps, or tachometer.
Work and wiggle all connectors. Work them in out several times, inspect visually with a flashlight. "Working" them will scrub corrosion off terminals, and give you a chance to feel how tight they are. Pay particular attention to the distributor connector.
Measure resistance of the distributor pickup carefully. Make sure you have good tight connections.
Then switch your meter to low AC --that's right AC volts-- and connect to the distributor connector. Cranking the engine should give you about 1V AC
Inspect the inside of the distributor. Wiggle the shaft, look for play, look for debri, rust, strike damage. If possible, get a brass feeler (O'Really's) and check the gap at .008 inches
Now, "rig" a spark test gap. Best to buy a parts store test gap. Several brands. "Rig" your clip lead to the coil POSITIVE
Take the harness connector that fits the distributor, "vehicle" end. Ground the bare terminal. This should produce ONE spark "snap" each time you ground it.
Check coil pos and neg. volts. POS with your clip lead should be 12V "same as battery." NEG side of coil should be LOW, perhaps 1V or so, less than 2V. IF IT IS HIGHER the ECU is not grounded or it is bad
(Make SURE the ECU is grounded. Scrape around the mounting, use start lock washers to remount tight)
Try cranking and see if you get sparks out of the coil with your test gap or a test spark plug
