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Topic Review (Newest First)
12-30-2005 05:31 PM
trees Doc Vette has just high lighted and underscored the most common cause of electrical problems in the automotive industry: POOR GROUNDS!!!. Follow his guidelines and you will never have an electrical problem that is not the result of a short, cut wire, or burned out electrical/electronic component.


12-30-2005 04:36 PM
docvette Doc here,

ALL good information!

Remember to use rubber grommets if you run a cable the length of the car..or have to pass through a bulkhead with it..and everywhere you come close to a metal edge, use anti~Chafe, and don't forget a good clamping system..(and plastic ain't it..)

To build the very best ground buss:

Run a properly gauged Ground cable from the battery to any handy bolt at or near the starter, On the BLOCK. From that very same bolt get a Battery cable at the parts store, that has two 3/8 ring terminals on each end and attach it there and to the Frame rail.

Run an 12 ~18 gauge wire from the Fuel tank sender ground lug to the frame rail.

Next get some 10 gauge wire and ring terminals and run that from your bolt on the block to the Firewall, and another to the Alternator bracket or mount bolt.

If the Bracket and alternator is power white remove them both and their hardware, sand or pressure wash them until clean semi shiny metal, dry and reinstall.

You have electrolysis there..and it will also eat a water pump impeller up faster than any acid..The Alternator Bracket and Alternator housing is Aluminum and the block is Steel..(what were they thinking?)

When you go to reinstall the brackets, go to the hardware store and get some aluminum wire compound, and coat everywhere the mount hardware meets steel (bolts, mount surfaces Ect..)

Next get some Wire Braid, (Radio Shack) and install braid from the radiator support to the frame, Fenderwells to frame , hood to firewall, Doors to door posts, gas flap to body, tailgate / Trunk to body.

At each point the wire is grounded, Burnish ALL the paint and grease off to bare metal. Use a proper star-washer and lock. Use sheetmetal or Tech screws where no screws are available.

It sounds like a lot of work, but after you assemble all the parts, it's only a few hours to do..and you'll end up with a system that will work reliably for many years to come..and can eliminate that from your troubleshooting list.

A lot of this Larry and 302/Z28 already covered..this is to help you to ground stuff you probably never considered...

12-30-2005 12:37 PM
larryblack I too use the marine grade cables. #2AWG for under the hood batteries and #0 AWG for trunk mounted ones. #2 welding cable makes good conductors but the marine grade is STANNOUS coated for corrosion resistance. The coating looks shiny like silver but is actually good old tin. Make sure you run the negative cable to the ENGINE not the frame. Then run the flex strap from the fire wall to engine and a cable from the engine to frame.

I also use the red and black heat shrink with GLUE. This stuff totally seals the connections after you properly crimp the lugs on. Most electrical supply houses will crimp a connector or two for low $$.
12-29-2005 06:17 PM
302 Z28 I agree with Doc, however it is always a good idea to go with the larger cable. I have found for relocating the battery in the trunk marine grade cable works very well. It is very flexible like welding cable and can be had in various AWG sizes and colors. I got mine from McMaster Carr When I located my battery in the trunk, went with 1/0 AWG catalog #6948K75.

12-29-2005 05:49 PM
docvette Doc here,

4 gauge to 0/0 depending on length of run..

12-29-2005 05:47 PM
battery cables

What is best for battery cables? What size is the minimum?

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