question about grounding
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Senior User
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question about grounding
i have a 300 inline 6 1986 and was wondering does the battery ground wire have to run down to the frame first and ground then to the tranny bolt or can it run straight to the tranny bolt
Cargo Master
Joined: Mar 2008
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From: Washington
Fleet Mechanic
Joined: Jun 2010
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From: North Carolina
Grounds use whatever and all connections available to them, they are just a pathway back to the negative terminal of the battery. So the more the better. It might still work fine only going to the transmission, but consider that Ford may have had an actual reason for grounding that cable both to the frame and the transmission.
Post Fiend
Joined: Jul 2004
Posts: 8,786
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From: Northern California
The battery negative cable is supposed to go to one of the starter mounting bolt. 300-6. Not the transmission.
There is an additional frame grounding tang, midway on this cable.
The tranny mount, and engine mounts are rubber insulated, and they are also meant to flex slightly under torque, so it's not a good grounding point etc...
The cab needs a ground cable from the engine to the firewall as well. The cab mount bushings are also rubber insulated.
There is an additional frame grounding tang, midway on this cable.
The tranny mount, and engine mounts are rubber insulated, and they are also meant to flex slightly under torque, so it's not a good grounding point etc...
The cab needs a ground cable from the engine to the firewall as well. The cab mount bushings are also rubber insulated.
Laughing Gas
Joined: Feb 2011
Posts: 1,147
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From: Vine Grove KY
Thanks for brining this up, I have a question on 86' 302 EFI grounding. I just pulled and rebuilt the motor and trans. The only grounding I saw on the whole setup was a negative battery cable to the engine block and some grounding lugs coming from the wiring harness that bolt to the intake manifold bolts. There may have been something going from the battery to the chassis but I can't remember. Shouldn't there be more than that? Like a strap going from the block to the chassis, or a strap going to the transmission somehow? Sorry to hijack your thread trumsey.
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Post Fiend
Joined: Jul 2004
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From: Northern California
Yes there is a grounding point to the frame, but it's different between a 300 and 302.
The V8's can actually ground through the mounting bolts on the engine mounts.
The 300 cannot do it that way satisfactorly, as they are designed different, naturally.
You can add a cable between the engine block and the frame to satisfy your grounding needs as an option.
The V8's can actually ground through the mounting bolts on the engine mounts.
The 300 cannot do it that way satisfactorly, as they are designed different, naturally.
You can add a cable between the engine block and the frame to satisfy your grounding needs as an option.
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Laughing Gas
Joined: Feb 2011
Posts: 1,147
Likes: 6
From: Vine Grove KY
Yes there is a grounding point to the frame, but it's different between a 300 and 302.
The V8's can actually ground through the mounting bolts on the engine mounts.
The 300 cannot do it that way satisfactorly, as they are designed different, naturally.
You can add a cable between the engine block and the frame to satisfy your grounding needs as an option.
The V8's can actually ground through the mounting bolts on the engine mounts.
The 300 cannot do it that way satisfactorly, as they are designed different, naturally.
You can add a cable between the engine block and the frame to satisfy your grounding needs as an option.
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