05 Magnum 330
How can i tell/test if the solenoid (by the battery) is bad?

I just bought a new battery. Cleaned all the cables.
And My tach and display is not coming on.
Could it be the solenoid or something else?

 

welcome to the forum,use a screwdriver to cross the two posts where the batt+starter is hooked, if spins starter solenoid good.look at wiring for display and tach,not related

 

I have tried the screwdriver bypass. And it does spin the starter. So then that is good?

But why would I not get anything to come on at the Tach? Should I be getting any readings from voltmeter at the key switch?

I also have another issue with the fan. WHen the battery is connected the fan comes on without the key switch on. I have ordered a new "transmister" which I believe controls when the fan cuts on and off. Would a bad transmister that creates a "overheating" light to blink cause the lectrical system to shut down?

 

Could it be an ECM issue?

 

the thermister turns the fan on and off.it is not going to activate the fan while the switch off.like magnum said, could be ecm or ign switch related.check wiring.

 

I just ordered a haynes repair manual. Then I will double check all the wiring.
Then if all else fails I can take it to the dealer who will be more than happy to take every penny they can. Me and local dealer have never seen eye to eye.