66 Mustang Under Hood Wiring - Ford Mustang Forum

LinkBack Thread Tools
post #1 of 3 (permalink) Old 05-23-2006 Thread Starter
Rascal M's Avatar
Joined: May 2006
Location: Virginia
Posts: 3
Question 66 Mustang Under Hood Wiring

My 66 mustang coupe orginally came from factory with a 6 cylinder and i've upgraded it to a 351 windsor. Question is, will the wiring harness from the 6 cylinder work with the 351? I can't get the solenoid to kick in when I turn the ignition switch to start. I can cross over the solenoid with a screwdriver and it will crank the engine. I have the wiring diagram but unable to figue it out.


Rascal M is offline  
Sponsored Links
post #2 of 3 (permalink) Old 05-23-2006
PONY Member
5.0L Member
Blade10's Avatar
Joined: Mar 2006
Location: Northern
Posts: 472
Yes the harness will work.

My Guess is that you probably forgot to plug in the two connectors on the right hand (drivers side) of the firewall or you might have reversed them. They each have 2 wires and can be reversed. One of the connectors is the reverse lights, the other is the starter circuit. (Im trying to explain you can plug the start circuit into the reverse lights and vice versa, hope what I mean is clear.)

If you get lost PM me and Ill send you a picture of the connectors I am talking about.


Blade10 is offline  
post #3 of 3 (permalink) Old 05-30-2006 Thread Starter
Rascal M's Avatar
Joined: May 2006
Location: Virginia
Posts: 3
66 Mustang Under Hood Wiring

Thanks Blade, I finally figured out the problem. It was the neutral safety switch. My understanding was that this mustang came from factory with a 3 speed manual and it wouldn't have this switch. Well I guess somewhere along the way someone installed a different wiring harness. The 351 fired up without a bit of trouble after crossing over the safety switch.
Rascal M is offline  
Sponsored Links
Closed Thread

Quick Reply

Register Now

In order to be able to post messages on the Ford Mustang Forum forums, you must first register.
Please enter your desired user 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, otherwise you will not receive the necessary confirmation email needed to confirm, validate and activate your new AFM member account.

Failure to provide a VALID email address, will result in the cancellation of your new AFM member account registration.

Email Address:


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.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

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 Off
Pingbacks are Off
Refbacks are On

For the best viewing experience please update your browser to Google Chrome