A coil needs both voltage to it and changing current through it to work, the
implication is that you have only checked the former. Do you have points or
the original electronic ignition system? Points and the original Opus 45DE4
system (although a 1980 wouldn't originally have had that) can be checked
statically but the 45DM4 can only be checked dynamically. For the first two
turn the engine until it is coming up towards top dead centre on any piston
and at any time before about 10 degrees BTDC the points should be closed and
the 45DE4 module powering the coil. This is checked by monitoring the
coil -ve terminal (white/black) and making sure it is changing between 12v
and 0v i.e. a ground as the points close/module energises the coil. At the
same time check that there is still voltage on the coil +ve, about 6v in the
case of a 1980 with ballasted ignition.
If the coil -ve stays at 12v then the circuit through the points is open
(wire to points, burnt points, distributor ground wire), or the electronic
module is faulty.
If it stays at 0v, check the +ve, and if that is switching between 12v and
0v then there is a bad-connection back through the ballast resistance and
ignition relay. If it's at 0v all the time it is open-circuit. If it's
staying at 6v, but goes up to 12v when you remove the wires from the
coil -ve then there is a short-circuit from the points or module. If it
stays at 12v as you turn the engine then the coil primary is open-circuit.
The 45DM4 only gives a short pulse of duration controlled energy to the coil
as the engine is turning, rather than the on and off points being controlled
by crank angle, so these voltage changes will only be momentary at the
trigger points and not static while the engine is static. The static
condition i.e. crank not being turned for a 45DM4 should always be 12v on
both coil +ve and -ve.
An SU pump not working can be either not clicking at all if the points are
burnt or solenoid burnt out, or just clicking once if the points are stuck
together because of a spike and pit, or if the movement of the solenoid is
not sufficient to throw the points open. Check there is 12v to the pump
measured between the two spades on the pump, not just between the 12v spade
and a body ground.
----- Original Message -----
> Problem #1: there is no charge coming from the coil to the plugs, but
> there is power going to the coil.
> Problem #2: the fuel pump isn't pumping.
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