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How to Replace Ford Mustang Electrical Harnesses

173 0401 Wire 15A Z
173 0401 Wire 15B Z
14 (above and left) The headlight-harness... 
   
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14 (above and left) The headlight-harness feed begins at the main wiring loom behind thedashboard on the far lefthand side. Push the firewall plug through untilthe retainer clips pop through the firewall. This is the way the pinsshould look.
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15 (above and left) The windshield-wiper... 
   
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15 (above and left) The windshield-wiper switch installs like this. JMC Motorsports usesa special tool to tighten the column. You can order this tool, and otherswitch collar tools, from JMC. Connect the leads and install the switch.The knob is retained with an Allen screw.
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16 The headlight switch is... 
   
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16 The headlight switch is next. A gang plug gets the job done here.Position the switch in place and tighten the collar with a commonscrewdriver or the special tool mentioned earlier. Install the headlightswitch knob and shaft. Push the shaft all the way in and turn until theshaft seats and locks.
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17 (above and left) The engine... 
   
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17 (above and left) The engine gauge feed firewall plug installs mid-firewall. Behind thedashboard, there are pigtail leads for accessories and the automatictransmission indicator light. Push this plug through the firewall untilthe retainers click. It should look like this installed.

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