1966 mustang coupe headlights

[fire]

I just bought a 66 mustang and the headlights are very dim. Wondering if I could replace them with xenon, halogen, or anything that would be stronger without needing to install a new wiring harness.

[Otlaw80]

i believe you would have to do some re wireing, Read something before about having to put in a relay or something, its been a while, i'll see if i can find the info again.

[fire]

Thanks. Please, let me know if you find anything that works without a wiring harness.

[Otlaw80]

Been looking but haven't found anything without a wiring harness. Found these though.

Lights
Mustangs Plus*::*Electrical*::*Headlamps*::*1965-73 Xenon City Headlamps (Pair)

Harness
Mustangs Plus*::*Electrical*::*Headlamps*::*1965-73 Xenon City Headlamps Wiring Harness

[fire]

I really appreciate the help! I'm ignorant when it comes to working on cars and don't want to spend a lot on simple repairs. I will spend enough on the bigger ones! Many Thanks!!

[Otlaw80]

You should post up some pics of your stang in a new thread when u get a chance. I love the classics, regardless of shape

[66gt350ps]

Halogen may require more amps from the alternator and different guage wiring. The dimness is from a bad load on the system or dirty connectors and should be checked. You may simply have dirty engine and body ground connections, a weak alternator, faulty relay or a poor battery. A 1966 Mustang shop manual and an ohm meter can take you through what to check. A bad electrical system will only making the expense of putting in halogen lights worse.

Try disconnecting and wire brush cleaning all the major connections: battery, engine grounds(especially to firewall), relay connections, etc. Good luck

[66gt350ps]

Most common is faulty or dirty ground to body and/or engine. Some sealed halogens do not need wire, light switch, etc. upgrades while others do. Go on the web to check a particular brands specs. first.