We need a place to list all our electrical suppliers, so let me start the ball rolling:
Connectors:
http://www.vintageconnections.com/
http://www.oregonmotorcycleparts.com/
http://easternbeaver.com/Main/Elec__Products/Connectors/connectors.html
Cycle Terminal
I have bought from all three and they were all excellent.
Waytek also sell Molex waterproof connectors
Wires can be bought by the foot or roll.
http://www.wiringproducts.com/contents/en-us/d40.html?gclid=CMqXn-ysvKsCFcG8KgodQw-JuA
http://www.delcity.net/store/20-gauge/p_181397.a_1
http://www.kayjayco.com/catPWireGXLTXL.htm
http://order.waytekwire.com/products2/M50/360/50/650/1/20%20GA%20GPT%20Primary%20Wire/GPT%20Primary%20Wire%20SAE%20J1128/Wire%20And%20Cable/
Waytek also sell TWP (thin wall) wire as well as GPT (general purpose) wire.
Wire Sizes
You can use 20 or 22 gauge for LED lights or even thinner, but use thicker (18) for most circuits and probably 14 gauge or thicker. Here's a simple calculator http://www.gtsparkplugs.com/WireSizeCalc.html
and guide http://www.offroaders.com/tech/12-volt-wire-gauge-amps.htm
Or check this article http://www.rowand.net/Shop/Tech/WireCapacityChart.htm
Cable wrap and shrink wrap
Then you need a good supply of heat shrink tube and sleeve http://cableorganizer.com/fray-resistant/
Relays
Use a relay on the ignition and headlamps and you get better lights and stronger sparks
Connectors:
http://www.vintageconnections.com/
http://www.oregonmotorcycleparts.com/
http://easternbeaver.com/Main/Elec__Products/Connectors/connectors.html
Cycle Terminal
I have bought from all three and they were all excellent.
Waytek also sell Molex waterproof connectors
Wires can be bought by the foot or roll.
http://www.wiringproducts.com/contents/en-us/d40.html?gclid=CMqXn-ysvKsCFcG8KgodQw-JuA
http://www.delcity.net/store/20-gauge/p_181397.a_1
http://www.kayjayco.com/catPWireGXLTXL.htm
http://order.waytekwire.com/products2/M50/360/50/650/1/20%20GA%20GPT%20Primary%20Wire/GPT%20Primary%20Wire%20SAE%20J1128/Wire%20And%20Cable/
Waytek also sell TWP (thin wall) wire as well as GPT (general purpose) wire.
Wire Sizes
You can use 20 or 22 gauge for LED lights or even thinner, but use thicker (18) for most circuits and probably 14 gauge or thicker. Here's a simple calculator http://www.gtsparkplugs.com/WireSizeCalc.html
and guide http://www.offroaders.com/tech/12-volt-wire-gauge-amps.htm
Or check this article http://www.rowand.net/Shop/Tech/WireCapacityChart.htm
Cable wrap and shrink wrap
Then you need a good supply of heat shrink tube and sleeve http://cableorganizer.com/fray-resistant/
Relays
Use a relay on the ignition and headlamps and you get better lights and stronger sparks