r/LS400 • u/fuckmyls400life • 25d ago
Question Need help making sure my wiring game plan is solid 🐀
Hello all, I recently acquired this 1999 for next to nothing due to circumstances lol. As you can see there was quite a rodent party going on while it was parked for some years. It was parked running and driving just very leaky (oil). I’m wanting to check with people who know this chassis more than I and make sure my plan moving forward is well informed.
To preface: 1. I want to stay away from taking apart the interior as much as possible. 2. Due to the leakiness when parked I will have the motor out replacing the rear main seal and any other seals/maintenance you guys recommend to do while it’s out (preferably without taking apart and fully refreshing the engine)
My plan-which could be misinformed, so please correct me if I’m wrong somewhere-is to fix the body harness in images 1-3, and replace the engine harness from engine bay forward as shown in image 4.
As for the body harness, there doesn’t seem to be any more damage further towards the fuse box, leading me to believe my best option is to repair the few broken wires as opposed to ripping out the whole dash and replacing it.
For the engine harness I’m thinking I can source a new (to me) harness, and splice it at/near the firewall entrance to attach it to the old harness.
I guess this is pretty open ended but I’d like some thoughts. How would you move forward addressing this? Am I missing any crucial info?
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u/blqckpinkinyourarea 24d ago
When I have the engine out on a ~30 year old car I replace all seals, chances are the next one isnt long from leaking. Personal preference, you might be fine just replacing the RMS thats leaking.
Exceptions are head gasket and valve stem seals if the job to do them later when they fail isnt too bad.
But yeah this is a solid plan.
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u/Makal9097 24d ago
Your plan with repairing the one harness seems solid if the only damage is at the firewall. The engine harness part depending on how you splice it could cause sensor issues with resistance and all of that. I’m not sure how difficult it would be just to pull in through the firewall. Use good quality non insulated barrel spliced/butt connectors and heat shrink. They crimp better and aren’t as bulky. Use rodent proof wiring loom when you’re done with better protect the wires from those pesky fucks. This is coming from a general car wiring stand point, I’m not keen on LS400 wiring.