I have a 1994 Ram 1500 5.9l and for some reason when it rains. When I turn the key dash lights light up but no sounds from the motor. Start is good because if I leave the key on run and supply 12v to the trigger on the starter the truck starts right up. I supplied 12v to the starter relay and head the clicking (I still need to do a continuity test to confirm contacts are still good).

To my knowledge the only things I am left with (if relay is truly good) is ignition switch or wiring issue.has anyone experienced this issue?

 

Does the relay even click when you turn the key? If not, I would be looking for an issue between the ignition switch, and relay.

 

Not sure. I'll have to find someone to give me a hand to test that.

 

Next to the battery is the power distribution center where the starter relay lives. In my '97, there are two other relays for different systems but they are all the same part#. You can swap these relays to see if the problem goes away.

 

Thats good to know that I can just swap the relay. I'll have to wait for the next rain. When it is dry everything works as it should.

 

Had some rain today with trouble starting again. I swap the relay with the one for the fuel pump. Still not even an attempt to start. So it looks like it's definitely either wiring or ignition switch.

 

So I replaced the ignition switch and I am still having the issue. I am assuming that it is an issue with a wire, Does anyone know if a 94 would have anything "anti-theft" in it (I doubt it do to its age)?

 

No anti-theft stuff that I am aware of. (at least, not factory.....)

How is the gasket between the firewall, and hood? Is it all there?

 

The seal is still soft with no cracks, it has become somewhat flat over the past 24 years but still appears to make a seal.

 

I don't think that is your problem. I have no seal and a big hole cut in the cowl that water can drip from. Maybe open circuit on wires?