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post #1 of 7 (permalink) Old 10-23-2013, 01:53 PM Thread Starter
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Ground Question

I have a ground question - where is the firewall to block ground at/located? I can't seem to locate on the car (Or in the Ford electrical manual)

If there isn't one from the factory, is it recommended to add one, and if so, where should it be mounted from and to?
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post #2 of 7 (permalink) Old 10-23-2013, 02:21 PM
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I'm not 100% sure on the 3.8, but on the V8 cars, it is on the passenger side under the wiper cowl area.

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post #3 of 7 (permalink) Old 10-23-2013, 02:31 PM
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if there is no ground from the engine to the firewall, or any other places for that matter, it is a wise idea to add one. in fact EVEN if there is a ground, it is wise to add another one. you can pick up any good conductive spot where you get good metal to metal contact, and run to any spot on the chassis again where you get good metal to metal contact. what i have done on may cars is ground the battery cable to the block, like the factory did, and the run a ground from the battery terminal to the chassis, again like the factory did in many cases, as well as a ground strap from the back of the engine to the firewall. dont be afraid to have three or four ground straps either, remember of the top ten electrical problem causes, the first four are bad grounds.

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post #4 of 7 (permalink) Old 10-23-2013, 02:32 PM Thread Starter
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Quote:
Originally Posted by MadMikeyL View Post
I'm not 100% sure on the 3.8, but on the V8 cars, it is on the passenger side under the wiper cowl area.
I don't remember seeing one in this area - I know I have the ground strap from body to hood area there.

I'm also curious if the ground strap might be missing (if anyone had a photo that would be great)
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post #5 of 7 (permalink) Old 10-23-2013, 02:58 PM Thread Starter
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Quote:
Originally Posted by rbohm View Post
if there is no ground from the engine to the firewall, or any other places for that matter, it is a wise idea to add one. in fact EVEN if there is a ground, it is wise to add another one. you can pick up any good conductive spot where you get good metal to metal contact, and run to any spot on the chassis again where you get good metal to metal contact. what i have done on may cars is ground the battery cable to the block, like the factory did, and the run a ground from the battery terminal to the chassis, again like the factory did in many cases, as well as a ground strap from the back of the engine to the firewall. dont be afraid to have three or four ground straps either, remember of the top ten electrical problem causes, the first four are bad grounds.
Always good information rbohm.

I have a #2 from battery to header, #0 from battery to block. I will have to find a strap, or a couple of #0 lugs.

I was primarily curious on the "factory" way to see if it was even still there (or missing/damaged/etc)
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post #6 of 7 (permalink) Old 10-23-2013, 02:59 PM
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the 4.6 cars have it on the RH frame rail ahead of the shock tower. The other end is bolted to the motor mount stud. I don't see why it would be anywhere else on the 3.8 and I don't remember any MN12 having it grounded to the firewall.

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post #7 of 7 (permalink) Old 10-23-2013, 03:15 PM Thread Starter
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Quote:
Originally Posted by XR7-4.6 View Post
the 4.6 cars have it on the RH frame rail ahead of the shock tower. The other end is bolted to the motor mount stud. I don't see why it would be anywhere else on the 3.8 and I don't remember any MN12 having it grounded to the firewall.
That I did see that ground on the electrical diagrams.
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