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07 hemi ram mega cab is down


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burntkat 
Copper - Posts: 143
Copper spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: October 26, 2003
Location: South Carolina, United States
Posted: January 26, 2014 at 10:15 PM / IP Logged  
Classic symptoms of a dead starter solenoid or switch. At this point we've proven that there is the ability to move enough current through the cables from BATT to starter, so we know the battery is good and the primary cables are good. Jumping off the starter solenoid terminals shows us the output to the starter is likewise G2G.
This leaves us with the high likelihood of a bad starter solenoid (which may be part of the starter, I'm a Chevy guy so don't know how Dodge does it), or a bad trigger TO said solenoid (which would point at the ignition solenoid.
Next trick is to take a wire from the battery (look on your wiring diagram to see if it's negative or positive trigger that actuates the starter solenoid) directly to the starter solenoid trigger.
-Break- So I got curious, and figured this was close to what you are working on, right?
http://www.oreillyauto.com/site/c/search.oap?keyword=starter&year=2007&make=Dodge&model=Ram+2500&vi=1434834
OK if so (and likely even if not, manufacturers tend to follow similar build methods across a given line), then you have an integrated starter solenoid assembly (part of the starter motor itself).
If so, check this video and follow his advice:
http://www.youtube.com/watch?v=UnmnWuuLfzE . He picks up where I left off before the "break" above, at about 04:30. You don't need a fancy switch to test the trigger side of things- just a piece of wire will work fine- 10GA or better, and do be careful!
I really think you're looking at a bum starter.
"Always listen to experts. They'll tell you what can't be done, and why. Then do it. - Robert A. Heinlein"
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: January 26, 2014 at 11:17 PM / IP Logged  
I just noticed....
houpy wrote:
I can't hear the fuel pump so I relieved pressure at the engine then turned on key and fuel pump is working.
I presume you mean you relieved the fuel pressure after the pump(?)!
For a sec I thought you meant oil pressure was controlling the fuel pump or relay (which IMO tho acceptable in some competitive circles, it should not be preferred or allowed) and that should require pressure to enable the fuel pump, not a pressure release.
Phew!    07 hemi ram mega cab is down - Page 2 - Last Post -- posted image.
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