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Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 9651
Experience:  worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling
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I have a 60 series Detroit DD3. It has no speedo and no RPM.

Customer Question

Hi I have a 60 series Detroit DD3. It has no speedo and no RPM. I have cruise control and Jake, i have fast idle and truck runs fine they checked the sending head and it is in good working order on the dash. Where would I check for a signal on the ECM if that's the problem?
JA: Sometimes things that you think will be really complicated end up being easy to fix. The Heavy Truck Mechanic I'm going to connect you with knows all the tricks and shortcuts.
Customer: ok thank you
JA: Anything else you want the truck mechanic to know before I connect you?
Customer: that's it for now
Submitted: 9 months ago.
Category: Medium and Heavy Trucks
Expert:  Wayne replied 9 months ago.

Hi I'm Wayne

I will help you with this

1st thing to do is unplug the terminals at the ECM ,

and clean them , they get dirty and corroded ,plus pins come loose ,

and pull back or bent

I hope this helps you