old headlights with new wiring - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Electrical
User Name
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 10-11-2009, 06:56 PM
Registered User
Join Date: Oct 2009
Location: Andalusia Alabama
Posts: 1
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
old headlights with new wiring

I have a 1951 F1 Ford truck with 7" Hi/low sealed beam headlights. I moved everything (engine, front axle, trans, rear end, steering wheel, computers, etc.) including the wiring harness from a 2003 Mustang GT to the truck. I cut the Mustang wiring at the headlight bulb and ran 3 feet of 18 gauge wire to the old headlights. (The 3 feet extra was because I tipped the hood). The Mustang wire size was much smaller than the wires at the old sealed beam three prong plug. Will the sealed beams and extra wire burn my Mustang fuse? What is the amps of the old sealed beam, Halagon, and the new lenes with H4 replaceble bulbs I see on the interner? Thanks

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 10-11-2009, 11:30 PM
Joe G's Avatar
Registered User
Last photo:
Join Date: Nov 2008
Location: St. Paul, MN
Age: 42
Posts: 727
Wiki Edits: 0

Thanks: 244
Thanked 126 Times in 105 Posts
The existing wiring (2003 Mustang) is designed to be used with #9007 bulbs which are rated for 65/55 watts.

If you get H4's that do not exceed this wattage rating, you should not have a problem. But some H4's (the ones that are not street legal) are rated as high as 100 watts - for these I would use additional relays, and heavier wiring just to be safe.

Sealed beam 7" halogens are also rated for 65 watts, so they should work with the Mustang wiring without any alterations. Of course, in 1951, the headlights would have been 6 volt, so you would have to replace them with 12v sealed beams if they're not already.

I never wire headlights with anything less than 16 gauge, I usually use 14, but that's just me.

If you get the headlight conversion kits, just do exactly what the instructions say and you should be fine.

Hope this helps...

Last edited by Joe G; 10-12-2009 at 12:35 AM.
Reply With Quote Quick reply to this message

Recent Electrical posts with photos

Quick Reply

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
home aluminium wiring - danger pigjamelectric Off-Topic 9 07-30-2009 09:58 PM
Relays on headlights kleen56 Electrical 38 04-26-2009 04:24 PM
1939 Plymouth Headlights; Halogen Replacements and Missing Sockets hduff Electrical 5 02-12-2008 10:30 AM
EZ wiring project zipfactor Electrical 3 05-21-2006 03:55 PM
Wiring harness from scratch, fuse values norcal02 Electrical 3 09-16-2003 11:03 AM

All times are GMT -6. The time now is 12:24 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.