Date: 1 Jan 2023
Issue
Defining terms
When using modern cable in older cars the current load and cable size differs from the original cables used during manufacture.
Wire is a generic term for extruded or stretched metal
Cable is a better term when describing the method of conducting power from one point to another.
For the purposes of this post the term ‘cable’ is used to describe the cables in a wiring loom (confused? me too!).
Diagnosis
To detemine the cable specification needed
- Work out the constant and peak current to be carried by the cable (see note below)
- Work out and allow for any voltage drop across cable length
12V Wire Size Calculator + Chart: What Size Wire You Need? (learnmetrics.com)
- Look up the cable core type and diameter needed e.g. copper, 1.5mm
- Decide the cable colour-pair to use
- Determine the length of cable required (then add an extra metre or two to allow for any under calculation)
Repair
Order cabling required e.g. 3m Green/White 1.5mm (16A)
Order terminations
Order heat shrink
For heavier gauges look up requirements (you can usually find what is needed on eBay.
Parts
Date:
| Part | Description | Supplier | Cost |
|---|---|---|---|
| Cable 3m lengths of 1mm² 16.5A cable – 85 COLOURS TO CHOOSE FROM – 12v car wire loom | eBay | £3.75 | |
| Heat shrink Heat Shrink Tube 2:1 Electrical Tubing Sleeve Cable Wire Heat Shrink All Colours | eBay | £4.49 | |
| Connectors classic ar wiring bullets for sale | eBay | see items | |
| Connectors classic ar wiring bullets for sale | eBay |
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