Pic of ground strap. Please help!!!!

[91notchbk]

I am putting my motor back in after painting the engine bay and installing new H/C/I. I have an extra ground strap and I don't remember were it goes. I have looked all over the engine and engine bay and I really do not know were it goes. I am hoping someone can guide me in the right direction. Thanks in advance.

 

[HISSIN50]

If you search JRichker's posts, he has one where he outlines all the grounds in the vehicle. It might be helpful.

Good luck.

 

[jrichker]

Try the back of the cylinder head or intake manifold to the firewall. It is problably the seconday power ground. It supplies ground for the alternator, A/C compressor clutch and other electrical accessories such as the gauges.

Gounds are not very particular where they are mounted as long as the metal contact patches where they bolt down are clean and shiny.

Any car that has a 3G or high output current alternator needs a 4 gauge ground wire running from the block to the chassis ground where the battery pigtail ground connects. The 3G has a 130 amp capacity, so you wire the power side with 4 gauge wire. It stands to reason that the ground side handles just a much current, so it needs to be 4 gauge too.

The picture shows the common ground point for the battery & alternator

Picture courtesy timewarped1972

 

[Mustang78]

looks like it might plug in somewhere, like on the side of your alternator bracket, or another bolt someplace, i suggest replacing it with a bigger ground, you can never have too many grounds, especially on an EFI car!

~Mark~

 

[riverviewnative]

Drivers side cylinder head

From the factory it bolts to the drivers side head in the back and with a 7mm bolt attatches to the firewall. And there is no need to upgrade.

 

[jrichker]

... And there is no need to upgrade.

You could just about say that for everything a performance enthusiast does to his Mustang.

If you have the stock alternator, this is true. If you have a 3G it isn't true. The stock ground is too small for a 130 amp alternator.

Many people think grounds are unnecessary, just junk wire added by some dumb engineer at the factory. In automotive circuits that is completely wrong. The ground completes the return path to the battery and alternator. Without a good ground, things don't work properly. Increasing the size and number of grounds can insure that there is never a problem in the electrical system.

 

[91notchbk]

Thanks, I will attach it the the back of the cylinder head and to the firewall.