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Old 08-31-2007, 10:46 AM
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Wiring Diagram

I bought that orange book on wiring for Hot Rods, but the writing is small and blurry and I can not always make out what it says. I have a 27 that I am building from scratch, the head, tail lights are not a problem nor are the gauges. I have not figured out the ignition- alternator -starter stuff . I am running a standard sbc Chevy 305HO with a alternator that has three wires. Also a standard distributor with an external ballast resistor. Another problem is the ignition switch which is a universal type (Autozone, Napa, Ron Francis's IS-01 & etc.) has 4 posts three are marked around the outside circumference, but there is one in the middle that is higher than the rest, I do not know what that is for. Does any one have a diagram that would help me?

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Old 08-31-2007, 05:24 PM
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the chevy with the 3 wire one is your main power for the battery. This should be atleast a 10 gauge lead. The other two now, if its the plug style....one is a ground lead which you can ground right there at the alt bracket. The other one is for signal from the ignition which is just a 12volt positive connection. What are the letters on the ignition collar/key??? some have a letters like G,R,B.....some are different. email me and let me know or repost on here....totally up to you.........
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Old 08-31-2007, 07:50 PM
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Doc here,

DO not GROUND any wires from the side plug at all!!!!!!! Both are 12 volts hot!

The BIG red lug (10 gauge wire) at the back is 12 volt output, goes DIRECTLY to the starter solenoid "Battery Cable terminal" Via a proper fuse link or maxi fuse..

The Smaller Red wire on the side plug, (14 gauge) is the Regulator excite wire for the internal regulator.

The Smaller BROWN wire is the FIELD output, and goes to the Charge lamp in the dash,

AT the rear of the alternator, there will be a threaded short hole or lug, may be marked "G" or not..a 10 gauge Black wire goes here and directly to your ground buss system.

The starter is simple, big terminal to the battery cable AND fuse buss wire.

The "S" wire (purple) goes to the NSS switch , then back to the Ignition switch "S" terminal.

The "I" Terminal goes directly to the coil + nut PAST the Ignition ballast resistor.

The switch should be BATT (power ) raised one, IGN, power in run only..Start..power in start only ... and ACC power in ACC only.



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Old 08-31-2007, 08:34 PM
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Quote:
Originally Posted by prodj28
the chevy with the 3 wire one is your main power for the battery. This should be atleast a 10 gauge lead. The other two now, if its the plug style....one is a ground lead which you can ground right there at the alt bracket. The other one is for signal from the ignition which is just a 12volt positive connection. What are the letters on the ignition collar/key??? some have a letters like G,R,B.....some are different. email me and let me know or repost on here....totally up to you.........
I bought a wire that goes on the alt and that had the directions with it so the alt I wired up today still got some of the ignition switch and starter to go, thanks for you help, Jack
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Old 08-31-2007, 08:48 PM
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Quote:
Originally Posted by docvette
Doc here,

DO not GROUND any wires from the side plug at all!!!!!!! Both are 12 volts hot!

The BIG red lug (10 gauge wire) at the back is 12 volt output, goes DIRECTLY to the starter solenoid "Battery Cable terminal" Via a proper fuse link or maxi fuse..

The Smaller Red wire on the side plug, (14 gauge) is the Regulator excite wire for the internal regulator.

The Smaller BROWN wire is the FIELD output, and goes to the Charge lamp in the dash,

AT the rear of the alternator, there will be a threaded short hole or lug, may be marked "G" or not..a 10 gauge Black wire goes here and directly to your ground buss system.

The starter is simple, big terminal to the battery cable AND fuse buss wire.

The "S" wire (purple) goes to the NSS switch , then back to the Ignition switch "S" terminal.

The "I" Terminal goes directly to the coil + nut PAST the Ignition ballast resistor.

The switch should be BATT (power ) raised one, IGN, power in run only..Start..power in start only ... and ACC power in ACC only.





Doc

A couple of simple questions; You stated "The starter is simple, big terminal to the battery cable AND fuse buss wire."

What is a fuse buss wire? I was going to run a #10 wire from the large lug to the amp gauge.

"The "S" wire (purple) goes to the NSS switch , then back to the Ignition switch "S" terminal."

What is NSS?

"The "I" Terminal goes directly to the coil + nut PAST the Ignition ballast resistor."

I do not quite understand "nut PAST the ........"

Now I stand in front of the car looking at the solenoid (sbc)is the I terminal on the inside or outside?

Lastly, probably most important, do I understand that there are two hot wire going to the ignition switch?

Thanks for your help, Jack
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Old 09-01-2007, 01:53 AM
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Quote:
Originally Posted by 2000jack
A couple of simple questions; You stated "The starter is simple, big terminal to the battery cable AND fuse buss wire."

What is a fuse buss wire? I was going to run a #10 wire from the large lug to the amp gauge.

"The "S" wire (purple) goes to the NSS switch , then back to the Ignition switch "S" terminal."

What is NSS?

"The "I" Terminal goes directly to the coil + nut PAST the Ignition ballast resistor."

I do not quite understand "nut PAST the ........"

Now I stand in front of the car looking at the solenoid (sbc)is the I terminal on the inside or outside?

Lastly, probably most important, do I understand that there are two hot wire going to the ignition switch?

Thanks for your help, Jack

Doc here,

The Fuse buss is all the fuses that make the car operate.......It needs to get power from somewhere.........


AMP GAUGES are "Old tech" and down right dangerous if anything goes wrong...ask around...EVERYBODY is going to volt gauges.

Neutral Safety Switch = NSS...required safety device..

It's quite simple, the primary ignition connects at the ballast resistor directly, using it resistance/Wattage as a buffer for the coil/points (6 to 9 volts) in normal run position...The Secondary wire , since it is only hot in crank, (12 volts) runs directly PAST the resistor to the + NUT on the coil...

On the SBC, the "I" terminal is located closest to the fenderwell...The "S" terminal is located closest to the block...........


There is ONLY one "Hot At All Times " wire going to the Ignition switch...24/7/365...the switch isolates Coil from battery buss, start mode, and ACC buss and provides an Isolated OFF for the coil..(Otherwise the charging alternator or a "hot bypassed" wire would keep the engine running long after you shut it off and walked away with the keys...


Doc
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Old 09-01-2007, 06:13 AM
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Quote:
Originally Posted by docvette
Doc here,

The Fuse buss is all the fuses that make the car operate.......It needs to get power from somewhere.........


AMP GAUGES are "Old tech" and down right dangerous if anything goes wrong...ask around...EVERYBODY is going to volt gauges.

Neutral Safety Switch = NSS...required safety device..

It's quite simple, the primary ignition connects at the ballast resistor directly, using it resistance/Wattage as a buffer for the coil/points (6 to 9 volts) in normal run position...The Secondary wire , since it is only hot in crank, (12 volts) runs directly PAST the resistor to the + NUT on the coil...

On the SBC, the "I" terminal is located closest to the fenderwell...The "S" terminal is located closest to the block...........


There is ONLY one "Hot At All Times " wire going to the Ignition switch...24/7/365...the switch isolates Coil from battery buss, start mode, and ACC buss and provides an Isolated OFF for the coil..(Otherwise the charging alternator or a "hot bypassed" wire would keep the engine running long after you shut it off and walked away with the keys...


Doc

Sorry to ask again, On the ignition switch is the hot wire the the tall post in the center or the one of the three side post of specifically the one that is marked battery?
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Old 09-02-2007, 02:07 AM
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Quote:
Originally Posted by 2000jack
Sorry to ask again, On the ignition switch is the hot wire the the tall post in the center or the one of the three side post of specifically the one that is marked battery?
Doc here,

Whichever one is marked battery.


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Old 09-02-2007, 05:22 AM
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Quote:
Originally Posted by docvette
Doc here,

Whichever one is marked battery.


Doc
Thanks for your patience,Doc!!

Also for the NSS switch thought, I forgot I needed one, but spent yesterday making one, so that another "Thanks". Only if they were dimes then you would be raking in the coins! Jack
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Old 09-04-2007, 05:03 PM
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Acc on switch ??

Sorry to hijack but I have a similar problem. Do I even need to use the ACC on the Ign. switch if I have no accessories in a "T" bucket?
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Old 09-04-2007, 08:17 PM
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I did not wire it on my 27. I never used it on my 29 and I have had that 2 years. Basically the acc switch is an alternate ignition post for items that run on the ignition switch such as a radio. Now running with the radio from an acc switch also you can circumvent the motor wiring thus using less power from the battery. Also I guess that without the motor running and the ignition switch on you could wear out parts like the points.
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