Turn Key and NOTHING HAPPENS under the hood

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gtex

SILVER Star
Joined
Aug 13, 2015
Threads
7
Messages
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Location
Oak Cliff, TX
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I just returned from Houston with my 2003 LX470 that I used to tow a boat for search and rescue missions after Hurricane Harvey. I was in deep water with the truck, some water intrusion into the cab, but it performed flawlessly while in Houston. Upon my return to Dallas, I let the truck sit overnight (still connected to the boat trailer) and upon returning the next morning, I could not get the truck to start.

Here are the issues:
1) turn key to position 1; all lights come on, a/c will work, windows go up and down, radio works, basically everything is normal
2) turn key to start; speedo/tach lights turn off, radio/infosystem turns off, a/c turns off, etc, but there is ZERO noise from the engine compartment; can't hear the solenoid, can't hear the starter, no clicks, nothing at all.
3) trailer wiring was spliced back together after being damaged during the storm and wires were not replaced in the correct order, causing failure of the lights on the boat trailer, failure of the front turn signal lights, and failure of the speedometer to function at all--tachometer and all other gauges worked, but not the speedo (maybe the odometer as well), or the information center functions that depend on speedometer/odometer to work. I drove home with CEL, VSC OFF, VSC TRAC lights illuminated.

What I have done so far:
1) inspected all fuses; replaced 2 fuses that were visibly blown including one for the instrument cluster.
2) replaced battery
3) tapped on starter relay while helper turned key
4) allowed everything to dry
5) observed headlights when key is turned--they do not dim at all

What I have identified as possible issues:
1) connections to the battery and body
2) connections to the starter
3) fusible link block
4) neutral safety switch malfunction
5) starter solenoid malfunction
6) starter relay failure

I AM NOT an electrical genius by any stretch, but I am a guy who desperately needs to get this truck sorted out and back on the road.

Any help will be greatly appreciated.
 
Haven't heard any thoughts on here, but I've been working on getting more data to share.

1) I've unhooked everything but the cable going to the starter from the battery/fusible link at the positive battery terminal.
2) When I move the ground cable onto the negative terminal, there is quite a bit of noise and heat that is generated...it seems like something is amiss with the starter.
3) All of this was AFTER I left the truck fully connected with a full battery last night, only to find a completely dead battery this morning.

Any help is appreciated.
 
I'm no electrical guy either, but it sounds like a short in the starter. If I understand your description, you disconnected all excess wiring today and not yesterday. So, if there is a short that drained your battery, it could be somewhere other than the starter. But, you description of heat from the negative terminal with the ground wire while only connected to starter tells me it's a starter issue. Again, just a newb's thoughts. Hopefully an intelligent person will jump in here.
 

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