Ram loses power trying to start

[Cheddardip]

2012 ram 5.7
when key is at accessory I have electrical power, turn key to start I lose all electrical power, I need to disconnect battery for 10-15 minutes, then I have power again. I removed starter relay to jump start, hear a click at started then no electrical power to truck. Battery is good, replaced win,starter and tipm no change. Next trouble shooting step?

 

[04fxdwgi]

Check the battery cable connections, fuses at the battery, if you have them, push in all the fuses at the fuse box / TIPM and all your ground points for cleanliness and tightness.

There have also been cases of a cable failing due to a bad conductor inside the insulation that isn't actually visible. Only able to ID it through Voltage testing and checking voltage drop.

When I drove a tow truck the 1st thing we did was ask owner to try to start with headlights on. If they completely turned off immediately, the very 1st culprit was battery / ground connections / fuses 99% of the time.

 

[RamDiver]

Further to 04fxdwgi's recommendations, search YouTube for measuring voltage drop tests on battery and starter connections.

This will also help to identify any poorly performing connections that could be hidden.

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