Engine won't start
It will be reverse biased and will not light.
It may do this if you have the leads to the meter connected to the wrong ends of the battery.
the rotor in the distributor only turns around. It can not fire the wrong order. A wrong order happens when the wires are in the wrong order.
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you can blow fuses or the battery Possible computer damage.
The engine , if it runs at all , will , of course , have misfires and may have a 'backfire' .
Wrong measurement usually leads to wastage of resources. Similarly wrong measurement usually leads to the completion of a shoddy work.
Delayed treatment leads to misdiagnosis. And so, conditions like myocardial infarction, stroke, appendicitis, pulmonary embolism and miningitis are some of the diseases which are misdiagnosed. There is a possible injury if misdiagnosis happens and leads to wrong treatment.
If a charger is connected to the wrong terminals, it can cause reverse polarity, potentially damaging the device or battery being charged. This may lead to overheating, short circuits, or even fires. In some cases, built-in protection circuits may prevent damage, but relying on this is not advisable. Always ensure the charger is connected properly to avoid these risks.
If you put the spark plug leads back on in the wrong order the engine will most certainly miss fire. The best way is to find the number one spark plug wire and then follow clockwise the firing sequence for the engine.
It could be out of time. You could have a spark plug wire connected to the wrong place in the firing order.
There is no telling. TAke it to someone who has diagnoistic equipment. Check your firing order. If you re-connected one of the wires to the wrong cylinder, it will run out of sync. make sure the spar plugs are put in in correct order