Check Engine Light -Take It Seriously

....
Translating a few hundred dollars into a few thousand dollars.
What if you ignore the light and maybe it's for something serious?
This was caused by a failed Catalytic Converter and back pressure overheated one bank of cylinders of this Honda.






What COOKED looks like.


More like it should look.


New engine waiting to be attached to the trans-axle.



This is not a video game avatar. When it comes on, pay attention.

I recently wash my engine and had to use the water hose to rinse after doing the brushing with apc. After doing so, I saw the check engine light. I figured there might still be water on some areas that caused the check engine light to turn on. My question is, can I apply Dielectric grease on the alternator connector and fuse box terminals to prevent moisture and corrosion? I read this https://motoringcrunch.com/reviews/dielectric-grease/ and it seems to be a good thing to put on before doing an engine wash. Any thoughts?

The dielectric grease can't hurt. I put plastic bags over my fuse box under the hood and try to avoid electric parts when cleaning.