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Old 08-27-2010, 07:05 AM
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ground surface prep

Engine to frame, Frame to cab, Elec dash ground surfaces, other: What do you use on the metal surface to enhance longevity of surface contact and to prevent rust? ...antisieze? dielectric grease?

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Old 08-27-2010, 07:07 AM
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Quote:
Originally Posted by Fergusonic
Engine to frame, Frame to cab, Elec dash ground surfaces, other: What do you use on the metal surface to enhance longevity of surface contact and to prevent rust? ...antisieze? dielectric grease?
Dielectric grease and star washers
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Old 08-27-2010, 07:48 AM
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Pardon the interruption...Good question. I've been thinking about this too as it gets closer to wiring time...would it be best to find a place on my block or will a place on the aluminum heads be just as good for my engine ground? And do I need to sand to bare metal on the body and frame,dielectric grease, and then just repaint over the bolt/nut connection? Or will a star washer "bite" through the paint to metal and provide enough contact?
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Old 08-27-2010, 08:33 AM
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Originally Posted by Hwyhogg
Pardon the interruption...Good question. I've been thinking about this too as it gets closer to wiring time...would it be best to find a place on my block or will a place on the aluminum heads be just as good for my engine ground? And do I need to sand to bare metal on the body and frame,dielectric grease, and then just repaint over the bolt/nut connection? Or will a star washer "bite" through the paint to metal and provide enough contact?
thanks
I would clean it bare, get the connection locked down and then you can paint around it. I prefer attaching the ground to steel, Aluminum reacts funny with most metals, especially where electricity is involved.
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Old 08-27-2010, 12:08 PM
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i do like t-bucket said grind clean ground it and paint over it
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Old 08-27-2010, 12:13 PM
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The star washers are the key to a long lasting connection
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Old 08-27-2010, 01:05 PM
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thanks Yeah, thought the iron block might be preferred over the aluminum heads. RTYAUCH, where in AL? I've got some family in Clio and Muscle shoals
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Old 08-27-2010, 04:35 PM
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Athens about 30 -40 min east down 72 from Muscle shoals
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Old 08-27-2010, 06:58 PM
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Quote:
Originally Posted by Fergusonic
Engine to frame, Frame to cab, Elec dash ground surfaces, other: What do you use on the metal surface to enhance longevity of surface contact and to prevent rust? ...antisieze? dielectric grease?
I use dielectric grease on the terminal, star washer, and screw.

As a rule, I only use ground screws that are threaded directly into the metal they are attached to. Self-drilling Tek screws work great for grounding to frames and sheet metal.

On a car with the battery mounted in the rear, I weld 3/8" bolts to the RH frame rail near the battery and near the engine, and nut the ground cables to them with star washers and dielectric grease.
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Old 09-01-2010, 12:21 AM
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The surface oxide on aluminum is aluminum oxide which is a very good insulator. Anodized aluminum is even beter insulator. Any time you have to depend on a ground on aluminum you risk having trouble eventually.

Stainless wire brush the aluminum then immediately star washer and clean bolt. thru the connector. Cover it with dielectric grease.

I just had a bad ground on an aluminum solenoid housing. I skined it with a carbide cutter and new nut and star washer. It will work for a while but the first hint of trouble I'll have to do it again. Glad I have new solenoids in both doors.
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Old 09-01-2010, 02:16 PM
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thanks for insight on the aluminum problems..will use block instead of head
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