won't start...batt ok

1977 DODGE TRUCK
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MOPARMAD71
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  • 1 POST
I recently brought my 77 dodge truck to be fixed and the mechanic replaced the relay, ignition module, and park neutral switch.... and again 2 months later nothing worked electrical... I tested the battery and its good, and i got the engine to crank but connecting the batter directly to the starter and solenoid... but i have no idea why the cab doesn't have any power???.. the wires are good....
Jun 4, 2007 at 3:33 PM
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KASEKENNY
  • ✓Experienced Mechanic
  • 18,907 POSTS
If when putting power directly to the relay gets the vehicle to start, then the likely failure is the ignition switch or the fusible link coming to the ignition switch.

What I would do is go to the switch and check for 12 volts coming into the switch and then out when cranking the engine.

If you have in but not out, then the switch is the issue.

Here is a guide that will help with this:

https://www.2carpros.com/articles/how-to-check-wiring

Also, I am attaching the wiring diagram below but I know you tested the wires but we need to double check this because there is not much on this truck, so it is either the wiring or the switch.

Let me know what you find and what questions you have.

Thanks
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Mar 3, 2022 at 7:36 AM
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