Running wires thru firewall 2017 f150

[psycho]

That is the short track to a dead finals in your radio or a smoked amp! The inductive kick from the starter will exceed the voltage ratings of many components in the radio. The kick back will often be three time the supplied voltage and more in certain circumstances.
The alternator output post is a better location, Granted it needs to be filtered, but it is a lot easier than trying to fight inductive kickback from the starter and the solenoid.

Inductive kickback?????? Did you make that up?

 

[Tallman]

Inductive kickback?????? Did you make that up?

Not at all. where do you think the high voltage comes from on a simple motor like a 3 HP Briggs and Straton motor? Magneto with out DC power. Car with breaker points use inductive kick to make over 30KV from 12 VDC.
https://www.edaboard.com/showthread.php?271030-Inductive-kickback-voltage

 

[Handy Andy]

Anyone whom has had to deal with Hydro static waterlock - caused by steam and water leaking past a head gasket - can also find their alternator trio, or regulator - fried from the back emf when the starter moves the piston into the right spot during the compression stroke, only to force the piston back down the cylinder due to the spark advance too early ignited by the fluids that mixed with fuel from the backfire. Caused all by the deformation of the head to block and their dissimilar metal designs.

No, it's not impossible - and if you were around in the days, even the Model A could render you useless when the handcrank ratchet mechanism failed and it nearly took your hand with it.

:+> Andy <+:

 

[357magnum]

Handy Andy , reminds me of my first HD Sportster I had the adjustable spark advance set wrong one night , kicked it and it almost threw me in the bushes !

 

[undertaker]

Im going to give it a shot on Tuesday I will find a way!!!