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no headlights after cummins swap

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I swapped a 98.5 24v into my 01. Now no headlights, taillights, dashlights, or parking lights. I'm thinking it has something to do with the switches being different between the years, any help would be great. I'm self employed and this is my company truck and need it to go down the road.

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  • wil440
    wil440

    Am I missing something..... you put a98.5 engine into a 01 ??? How does that affect the headlight switch ?? Or am I reading your post wrong and just being dumb ? 

  • dripley
    dripley

    Me too. I had no idea the head lights were any part of the engine wiring harness

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  • Owner

Yes sir...

 

The wiring on the headlights are WAY different... Black is showing ground leads. Red is showing positive leads. 

 

2001 is... Constantly hot with +12V switch the ground to turn on.

+12V -> Fuse -> Bulb <- dimmer switch <- Headlight switch <- ground in driver side kick panel.

 

1998.5 is... Is switched +12V

 +12V -> Fuse -> headlight switch -> dimmer switch -> bulb <-grounds to radiator support. 

 

3 hours ago, GTCummins said:

I swapped a 98.5 24v into my 01. Now no headlights, taillights, dashlights, or parking lights. I'm thinking it has something to do with the switches being different between the years, any help would be great. I'm self employed and this is my company truck and need it to go down the road.

Am I missing something..... you put a98.5 engine into a 01 ??? How does that affect the headlight switch ?? Or am I reading your post wrong and just being dumb ? 

    • Like 1
    • Author

    Headlight switches are different

    Mopar1973Man what can I do to make it work? Wire in older switch?

    42 minutes ago, wil440 said:

    Am I missing something..... you put a98.5 engine into a 01 ??? How does that affect the headlight switch ?? Or am I reading your post wrong and just being dumb ? 

     

    10 minutes ago, GTCummins said:

    Headlight switches are different

    Mopar1973Man what can I do to make it work? Wire in older switch?

     

    Guess I am mising it too. I would have thought the 98.5 would be having a hard with the 01 electronics since the sensors are different. Thought the headlights were seperate from the motor harness. But is electrical is not my strong point.

    Wondering if he swapped pcm too or something along those lines 

    • Author

    Swapped everything that is attached to the motor, unplugged harness above pedals inside cab. Headlights are part of that harness. Just trying to figure out how to get headlights. Everything that is controlled by headlight switch including dash lights dont function.

    15 minutes ago, GTCummins said:

    Swapped everything that is attached to the motor, unplugged harness above pedals inside cab. Headlights are part of that harness. Just trying to figure out how to get headlights. Everything that is controlled by headlight switch including dash lights dont function.

    that explains the no lights, probably been easier to use truck harness connected to engine

    • Author

    You have to switch entire dash out of 98.5 into my 01 to get that harness. The motor harness plugged right into my 01 cab harness. Also installed 98.5 dash cluster into 01 cab. Everything works except for whatever headlight switch powers.

    18 minutes ago, wil440 said:

    that explains the no lights, probably been easier to use truck harness connected to engine

    I explained wrong headlights are a part of the engine wiring harness

    Edited by GTCummins

    • Author
    5 hours ago, Mopar1973Man said:

    Yes sir...

     

    The wiring on the headlights are WAY different... Black is showing ground leads. Red is showing positive leads. 

     

    2001 is... Constantly hot with +12V switch the ground to turn on.

    +12V -> Fuse -> Bulb <- dimmer switch <- Headlight switch <- ground in driver side kick panel.

     

    1998.5 is... Is switched +12V

     +12V -> Fuse -> headlight switch -> dimmer switch -> bulb <-grounds to radiator support. 

     

    What can I do to fix the issue rewire headlight switch? Install older switch?

    • Author

    Any input?

    Me too. I had no idea the head lights were any part of the engine wiring harness

    • Like 1
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    Welcome To Mopar1973Man.Com LLC

    We are privately owned, with access to a professional Diesel Mechanic, who can provide additional support for Dodge Ram Cummins Diesel vehicles. Many detailed information is FREE and available to read. However, in order to interact directly with our Diesel Mechanic, Michael, by phone, via zoom, or as the web-based option, Subscription Plans are offered that will enable these and other features.  Go to the Subscription Page and Select a desired plan. At any time you wish to cancel the Subscription, click Subscription Page, select the 'Cancel' button, and it will be canceled. For your convenience, all subscriptions are on auto-renewal.