mustang fuses

1965 and 1966 mustang fuse box guide

When you’re working on your Mustang restoration project you’re bound to blow the occasional fuse or two. This article will help you to locate the fuse box, seek out blown fuses, identify which fuse does what, and to replace the blown fuses with new ones with the correct amperage.

It’s always wisest to disconnect your battery when you’re doing electrical work, but sometimes it happens anyway – whether you’re working on interior lighting, installing a radio or repairing the instrument cluster.

You can easily identify a blown fuse with the naked eye. For one, the wire inside the glass casing will be broken. In case of short circuit, the casing will also show signs of discoloration or burning.

1965 and 1966 Mustang fuse box location

On a 1965 or 1966 Mustang, you can locate the fuse box on the drivers side, below the dash. It’s right above the kick panel, to the left of the steering wheel. You will need to get your head all the way in there under the steering wheel to be able to get a good look at it. Don’t forget to bring a flashlight!

Here is a picture and a diagram of what you’re looking for:

1965 and 1966 mustang fuse box

Fuse box diagram

Now all that remains is to determine which fuse is responsible for which electrical circuits. The following image will help you with this:

mustang fuse box diagram

  1.  14 AMP –  Back up Lights, Radio, Gear shifter PRNDL Light, Turn Signal
  2.  14 AMP –   Heater and Defroster
  3.  2.5 AMP * –  Instrument Panel, Cluster Lights, Tachometer Light, Radio Light
  4.  7.5  AMP –   Dome, Courtesy, Map Light, Glove Box and Luggage Compartment Lights, Clock Light, Seat Belt Warning, Door Ajar Warning
  5.  20 AMP – Cigarette Lighter, Emergency Warning Flasher

Note that not all of these are used all the time. Some of them are options and many of them were not available on a stock ’65 Mustang, like for example the emergency warning flasher or the dome light.

Make sure to use the right amperage for each fuse. New fuses can be found online, in most auto shops and even in radio supply shops. They generally come with a little plastic twist tool which makes removal and installation of the fuses a lot easier.

* Edit 23/07/2019: FYI, I just found out that the AGA 2.5-amp fuse no longer exists! It has been replaced by AGA 3-amp fuses, which do come in the correct size (the really short, stubby ones).

As a small encore, here’s an extract from the ’66 owners manual about fuses:

66 mustang fuse information

Did this post help you? Do you have experience with this subject? Share your thoughts or ask a question in the comments section!

11 thoughts on “1965 and 1966 mustang fuse box guide”

  1. The area for the 14 Amp (areas 1 & 2) and 20 Amp (area 5) fuses are the same size, do they sell a 20 Amp fuse the same size as a 14 Amp? I can’t find one.

    • Hey Gordon! Thanks for your comment!

      Good question, too! I’m not 100% sure myself. However, I’m going to check this as soon as I get a chance to pop over to my garage and get back to you!

  2. An AGX 20 fuse will fit, as the SFE 20 is too long (#5 in your diagram). Try part number BK7821064 at Napa for the AGX fuse in the 20 amp fating. Interestingly, I read that Ford changed the fuse rating from 14A to 20A, but forgot to make the location bigger in the fuse box to fit the longer 20A fuse.

    • Hey Howard,
      Thanks for your reply! Yes, that is indeed an interesting bit of historical information, i’ll definitely remember that one!


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