In the last few weeks I've burnt up two coils in my 1980MGB. Now that the hubby has had time to reflect he has came up with some conclusions, some thoughts, and of of course some questions. He is thinking that the last coil burnt up because my Brothers were going by the Bentley "1978 & Later MGB" and the Haynes electrical diagrams -- both of which he is sure is not correct for an 80 MGB when they replaced a coil for me.
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<span style="font-style: italic">Interesting Fact and quote from Moss:</span></span> "The original Lucas "Opus" electronic ignition used from 1975 to 1979 featured the ignition amplifier mounted on the distributor body. As this system proved unreliable, <span style="font-weight: bold">it was replaced in 1980 with the CEI system, which used a remote amplifier".</span>
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<span style="font-style: italic">What The Hubby Thinks: </span> </span>
1. The green white wire from the starter solenoid does not come into play even though it was left over in the harness from the previous years. Not needed because the coil uses 12 volts all the time.
2. No distributor resistor comes into play.
3. The resistive ballast wire does not come in to play even though it was left over in the harness from the previous years.
4. The coil positive side is fed from the whit wire at the ignition and not the ignition relay. If it is fed from the ignition relay there is enough voltage feedback when the key is turned off that the engine will continue to run.
<span style="font-style: italic"><span style="text-decoration: underline">What The Hubby Knows :</span> </span>
1. The ignition circuit is completely different that that shown in the late MGB schematics.
2. There are only two wires feeding the electronic (amplifier) on the 80 and they are a white and a white/black wire.
3. The 80 model year can be distinguished very easy because it has a remote amplifier with the coil mounted on top of it.
4. There are two wires, a red and a green, which feed the distributor from the amplifier.
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<span style="font-style: italic">Questions For You The Experts:</span></span> Is the hubby right with what he thinks and what he knows? Has anyone ever drawn a schematic to show correctly the ignition wiring of an 80 MGB? I hope this post makes sense and is not to long and boring.
Your turn
<span style="text-decoration: underline">
<span style="font-style: italic">Interesting Fact and quote from Moss:</span></span> "The original Lucas "Opus" electronic ignition used from 1975 to 1979 featured the ignition amplifier mounted on the distributor body. As this system proved unreliable, <span style="font-weight: bold">it was replaced in 1980 with the CEI system, which used a remote amplifier".</span>
<span style="text-decoration: underline">
<span style="font-style: italic">What The Hubby Thinks: </span> </span>
1. The green white wire from the starter solenoid does not come into play even though it was left over in the harness from the previous years. Not needed because the coil uses 12 volts all the time.
2. No distributor resistor comes into play.
3. The resistive ballast wire does not come in to play even though it was left over in the harness from the previous years.
4. The coil positive side is fed from the whit wire at the ignition and not the ignition relay. If it is fed from the ignition relay there is enough voltage feedback when the key is turned off that the engine will continue to run.
<span style="font-style: italic"><span style="text-decoration: underline">What The Hubby Knows :</span> </span>
1. The ignition circuit is completely different that that shown in the late MGB schematics.
2. There are only two wires feeding the electronic (amplifier) on the 80 and they are a white and a white/black wire.
3. The 80 model year can be distinguished very easy because it has a remote amplifier with the coil mounted on top of it.
4. There are two wires, a red and a green, which feed the distributor from the amplifier.
<span style="text-decoration: underline">
<span style="font-style: italic">Questions For You The Experts:</span></span> Is the hubby right with what he thinks and what he knows? Has anyone ever drawn a schematic to show correctly the ignition wiring of an 80 MGB? I hope this post makes sense and is not to long and boring.
Your turn