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

Tiny
SCANDLE66
  • MEMBER
  • 2007 LEXUS IS 250
  • 3.5L
  • V6
  • 2WD
  • AUTOMATIC
  • 2,000 MILES
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?
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Tuesday, August 29th, 2023 AT 7:38 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,949 POSTS
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.
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Tuesday, August 29th, 2023 AT 3:09 PM

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