The answer will depend on these answers:
1. What alternator do you have? Stock? Do you have a voltage regulator? If not stock, what amp rating?
2. What, if any, non stock electrical items and lights to you have or will have? Radio updates, amplifiers, A/C, halogen, etc.
3. What level of experience do you have with auto electrical?
4. What phase of the harness install are you at? What is done and what is not done?
5. What motor in truck?
6. Did you have all gauges working before deciding to do a new harness?
