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Old 12-30-2022, 06:26 AM   #1
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Exclamation No Lights, Heater or Radio. Run's perfectly

My truck is repeatedly blowing the Engine Control fuse after I accidentally plugged in a new battery the wrong way. It runs great but the turn signals, break lights, radio or heater don't work whatsoever. Were certain it has a short somewhere but I have no clue where. if anyone could give me any tips or possible ideas it would be much appreciated!
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Old 12-30-2022, 01:06 PM   #2
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Check the fusible links at the battery for the lights, etc not working. The engine control fuse blowing may mean the ECM got fried.
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Old 12-30-2022, 05:20 PM   #3
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Welcome to IN...

Yea, what Alabama said! You can DL the FSM at the link in my sig. GL...
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What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.

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Old 12-31-2022, 12:17 AM   #4
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No check engine light on, runs like a top. Lights the only real issue other than the fuse blowing.
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Old 12-31-2022, 01:55 AM   #5
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Go to the “EL” section of the Factory Service Manual(FSM) and check the circuits from point to point using a meter and continuity tests between each connection point.

You could also pull the passenger seat and open the top cover of the ECM & visually inspect(without touching the circuit boards) the boards and look for any burned spots(black).
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Old 12-31-2022, 04:05 AM   #6
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CEL is only for emissions on the D21. Pull codes from the ECM to see if it thinks anything is actually wrong.
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Old 01-03-2023, 01:12 AM   #7
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ECM is not burnt or damaged anywhere, fusable links seem fine.
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Old 01-03-2023, 05:39 AM   #8
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Quote:
Originally Posted by Arrio View Post
My truck is repeatedly blowing the Engine Control fuse after I accidentally plugged in a new battery the wrong way. It runs great but the turn signals, break lights, radio or heater don't work whatsoever. Were certain it has a short somewhere but I have no clue where. if anyone could give me any tips or possible ideas it would be much appreciated!
Have you checked the EL Section of the service manual and test the circuits that are not working?

If the truck runs great..then, great! Check the circuits in question.

Something is loading the circuit down and causing overloading and popping the fuse. Unplug the lights on at a time and power up with the key on and see if if the fuse blows. If not, try another component unplugged to see if the fuse blows again. Rinse. Repeat.

If when the fuse doesn’t pop with a component unplugged. You’ve found the culprit.


‘97 Hardbody Electrical Schematic:

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Last edited by PorknBeans; 01-03-2023 at 11:20 PM. Reason: Added Electrical Schematic
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Old 01-03-2023, 08:53 PM   #9
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Quote:
Originally Posted by Arrio View Post
ECM is not burnt or damaged anywhere, fusable links seem fine.
Seem? Ummmm, that's not how you test a fusible link.

Please check the FSM for the proper procedure.
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Quote:
Originally Posted by Deerhurst
What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.

-"No electrons were harmed during the creation, transmission or reading of this posting.
However, many were excited and some may have enjoyed the experience."
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Old 01-18-2023, 05:16 AM   #10
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it was the Fusible links. thanks for everyones help. just picked up a 83 toyota hilux from an old man, clean 1 owner
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