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Question:

Can I just use wire nuts to join these wires?

I made a kill switch for my car. All I need to do now is cut the wire that goes into my engine control module and join it with the switch I made. Would it be fine if I just use wire nuts or some sort of tape to join the wires instead of soldering? The instructions say quot;Step 6: Attach the killswitch wires one to each side of the wire you just cut. Step 7: Tape up all new connection.quot;It says to tape the new connections, but should I use exactly?

Answer:

Twisted wires can separate with the daily rattle and bumps of a car. I would crimp or solder it along with a shrink tube to secure it.
Solderless crimp-on butt connectors. $3.00 at Home Depot or Autozone.
Sure thing. Wire nuts work fine. I've used them a bunch on my project cars. However, if you want a connection that won't be affected by water (rain and/or humidity) and a connection that is permanent (won't come loose) use automotive crimp type connectors covered with heat shrink tubing or liquid electrical tape.
When you are cutting wires Especially when it concerns computers you should make a good mechanical connection and a good connection free from moisture and any type of corrosion. When I splice the wires together I use butt connectors with shrink warp and melt the shrink wrap around the wires after crimping the butt connectors together. You can buy heat shrink wrap at radio shack or any electrical supply store and buy heat shrink tubing to put over the wires. Some will say this is overkill, but since electricity passe's over the outside of the wire this is where you get corrosion and cause yourself headaches if the wire is not mechanically connected correctly. Wire nuts are for household connections like in florescent lamps or inside a connector box and normally used on single strand wire like romex 12/3 or 10/3 but not on multi strand wire. it's best to solder the wires together then heat shrink them if you know how to. Remember that .02 Ohms resistance can cause problems with computer operation hope this helps.

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