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Discussion Starter #1 (Edited)
2006; 3.7L; 125,000mi

Coil 5 continually blows.
Replaced coil from free used set several times and truck ran great but it would blow again in a day or 2.
Replaced plugs with copper set, gapped .040, new set of coils, new ECU.
This worked for 2 weeks and today it blew again.
Can't remember the codes but it was misfire on #5 and then there were a couple codes relating to the transmission (i do not know how this could be related other than a by-product of misfire).

I have read responses from various places and I have replaced what others have said is the problem but it clearly isn't.

Where do I go from here?

Thanking the community in advance!

@RamTech hoping you can help.
 

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That coil certainly got hot & melted
What spark plugs are you using ?

what year is your truck ?
 

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Discussion Starter #4
2006 with 3.7
It is a Dakota (not a ram)
This is the 6th coil that has blown.

Do you know where I can find a schematic of this? I would like to run wires directly from ECM but the ECM is packed tight and need to find the right wires.
 

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If the spark plug being used burns at a higher rate than stock, it will burn out the coils

The spark plugs that you should be using are

NGK 6987 {#ZFR6F11G} V-Power, Copper plugs
Gap 0.044"; Actual OE Part
$1.67 each
https://www.rockauto.com/en/catalog/dodge,2006,dakota,3.7l+v6,1432508,ignition,spark+plug,7212

The Coil On Plugs seems to be made by

UNITED MOTOR PRODUCTS COP101 United Premium OEM replacement COP coil
$16.87 each
https://www.rockauto.com/en/catalog/dodge,2006,dakota,3.7l+v6,1432508,ignition,ignition+coil,7060

The spark plug & coils are the same for the 2006 Rams with the same size engine
 

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Discussion Starter #6
If the spark plug being used burns at a higher rate than stock, it will burn out the coils

The spark plugs that you should be using are

NGK 6987 {#ZFR6F11G} V-Power, Copper plugs
Gap 0.044"; Actual OE Part
$1.67 each
https://www.rockauto.com/en/catalog/dodge,2006,dakota,3.7l+v6,1432508,ignition,spark+plug,7212

The Coil On Plugs seems to be made by

UNITED MOTOR PRODUCTS COP101 United Premium OEM replacement COP coil
$16.87 each
https://www.rockauto.com/en/catalog/dodge,2006,dakota,3.7l+v6,1432508,ignition,ignition+coil,7060

The spark plug & coils are the same for the 2006 Rams with the same size engine
That is exactly the plug and coil. Under the hood the sticker said gap to .040 so I did. 2 plugs needed adjustment but 4 were perfect.

This is not a spark plug issue. The set I replaced were Autolites. 6 coils on cylinder 5 is not plug or coil issue - it is something electrical. Maybe a bad wire which is why one of the things I would like to try is to run new wires from ECM connector to coil (reason for looking for schematic so I know which terminal(s) I am dealing with).

Zero issue with other cylinders and plugs from them look beautiful.
 
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