are my connections good for big 3

Hey guys I just want to make sure these connections for the Big 3 are good connects in my ford F150.

The first connect showing is from my battery (+)

To Altenator (+)

From Engine Block Ground (Between the 2 black tubes)

to Firewall 

And from Fire wall to Battery (-) (appx. 9 inches Inches away from the battery (-) terminal as shown below)

My main question is, is the engine block to the Firewall Okay? Im not sure if this is considered a chassy I was never big on maintenence

And is that Engine Block ground Accurate enough (Picture 3)?

Also How do I get that cap off of the Alt (+)? It doesn't seem to budge.

thanks alot

Ford F150

2006

XLT

4.6L

Extended Cab

I meant mechanics. its early

Im asking about the LOCATION of the connections not the Specific details in the way Im crimping them.

Should the resistance be consistant throughout the wiring? or is there a approximate number i should be trying to obtain. 

alright then yeah getting as close to absolute zero as possible is the way. But can someone tell me if those locations are good?

I've seen many trucks with the engine block to chassis going under the motor. Thats why im questioning this.

Can I just Ground the engine block to the Firewall (Which is the same place my Batter (-) is grounded to?

"Locations can only be good if metered with a DMM."

Sometimes factory grounds are not that great. That is why we're telling you to use a meter to determine if the locations that you chose are good. We can't tell this from pictures that you posted. Routing the wires under, over or around the engine is irrevelant in this case, just make sure that the resistance is as close to 0 as possible,regardless of location.

alright I kinda made out my answer from what you guys are saying. I was looking more for the "yes the firewall is also grounded to/with the chassis so it is ok to ground your engine block to to firewall"

because if i was saying i was going to ground my engine block  to my tires you would say "no that is not a good location because its not grounded to anything on the vehicle" but you wouldn't tell me to measure it with a DMM.

But since you haven't said Dont ground to the firewall I'll suspect it to be a relevant place

Thanks alot

Okay, I'll say it...

Don't ground to the firewall.

Why? Besides a small ground strap from the engine, how many other grounds have you seen on a car's firewill?  None?  Just what I thought.  I've been an auto mechanic for about as long as I've messed with car audio (not full time, but have worked in several shops over the years) and I've never seen anything grounded to the firewall.  The engine block is always grounded to the frame.  Why?  Because the body sits on rubber dampers that you can't see.  And so does the engine, in the rubber mounts.  The battery is always grounded to the engine, but the engine needs to always be grounded to the frame or you'll just be defeating the point.  If you did this, you would actually end up grounding the battery to the firewall too, because if it's not grounded to the engine and the engine is not grounded to the frame, you'll get a lose ground.  It IS okay to ground something to the firewall, but I just wouldn't make it the battery OR the engine unless you also have a ground strap/cable going to the frame.

I'm not claiming to be a car audio expert, but I can honestly say I've been involved in auto mechanics since I was a teen.  So I'm much more familiar with ground under the hood than many other car audio related questions or topics.

Hope this helps.