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Thank you for accepting me in your forum. I recently purchased a 74 custom dart body has minimal rust & it has a 318 engine that runs. Mechanic discovered that all the wiring behind the dash have been tampered with. All I need is a fuel guage and a odometer. Any suggestions? This is my 1st mopar
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Your best bet is to get a factory service manual with wiring diagrams and fix what was butchered. It's all pretty straightforward except this:
  • The gauges, except the speedometer, require +5v that is delivered by a regulator in the dash that steps the +12v down to +5v.
  • I'd consider bypassing the ammeter gauge while you are in there. It can be a fire hazard.
  • The fuel gauge requires the tank be properly grounded to get a reading.
  • Don't overlook the bulkhead connections, where corrosion can play havoc with electronics.
Worst case, new engine and dash wiring harnesses are available but expensive.
 

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Discussion Starter #3
Your best bet is to get a factory service manual with wiring diagrams and fix what was butchered. It's all pretty straightforward except this:
  • The gauges, except the speedometer, require +5v that is delivered by a regulator in the dash that steps the +12v down to +5v.
  • I'd consider bypassing the ammeter gauge while you are in there. It can be a fire hazard.
  • The fuel gauge requires the tank be properly grounded to get a reading.
  • Don't overlook the bulkhead connections, where corrosion can play havoc with electronics.
Worst case, new engine and dash wiring harnesses are available but expensive.
 

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Your best bet is to get a factory service manual with wiring diagrams and fix what was butchered. It's all pretty straightforward except this:
  • The gauges, except the speedometer, require +5v that is delivered by a regulator in the dash that steps the +12v down to +5v.
  • I'd consider bypassing the ammeter gauge while you are in there. It can be a fire hazard.
  • The fuel gauge requires the tank be properly grounded to get a reading.
  • Don't overlook the bulkhead connections, where corrosion can play havoc with electronics.
Worst case, new engine and dash wiring harnesses are available but expensive.
awesome .. 74 dart 318.. was my first Mopar when I was 16... some awesome memories in that car. Good luck with your project and welcome to Allpar.
 

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. . . I recently purchased a 74 custom dart body has minimal rust & it has a 318 engine that runs. Mechanic discovered that all the wiring behind the dash have been tampered with. All I need is a fuel guage and a odometer. Any suggestions? This is my 1st mopar . . . .
Here is a link to wiring diagrams for 1972 - 1976 Chrysler built vehicles. I would want to know that the engine temperature gauge and the oil pressure indicator lamp were working properly.

Mopar Wiring Diagrams - MyMopar.com - Dodge Plymouth Wiring Diagrams (at http://www.mymopar.com/72to76_wiring.htm )
 
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