After completing an engine swap when I try to start, and it just shuts everything off?

2007 LEXUS IS 250
2,000 MILES • 3.5L • V6 • 2WD • AUTOMATIC
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SCANDLE66
  • MEMBER
  • 1 POST
did an engine swap on my vehicle listed above, out and in, no issues. went to start, no dash lights, no sweeping of the gauge's nada. The infotainment system comes on, the push button to start lights up, tries to start and it just shuts everything off. rechecked all wiring and fuses/ relays, all good. I noticed the ignition relay has no power. When jumping the relay, the dash lights up. Could this be caused by the security system?
Aug 29, 2023 at 7:38 AM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
It sounds like the battery needs to be replaced or the battery connections are loose or corroded. I would check the main ground from the battery to the engine block and from the block to chassis. Please go over these guides as well:


https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

and

https://www.2carpros.com/articles/car-battery-load-test


Please go over these guides and get back to us.
Aug 29, 2023 at 3:09 PM
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