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This is a 2004 Toyota Tundra 4.8 L.

The truck started to have a mind of its own when it came to starting. All of a sudden it stopped, no sound, no crank, nothing.

I was told the starter is bad, so I replaced it. I put it all together and the same thing. The starter won't crank, won't even make a sound.

At this point, I'm thinking it's a relay issue, but can't seem to find which one it is exactly. Do you have any thoughts on what the issue could be?

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  • Welcome to Motor Vehicle Maintenance & Repair. Don't mean to insult you, but did you reconnect the battery? Also, it could be a relay, fuse, battery cable, battery, ignition switch, etc. The owners manual will likely have a diagram of the fuse box(es). That would be the first place I would look. If you were having trouble before, it may have blown a fuse.
    – CharlieRB
    Feb 18, 2018 at 18:59
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    did you make sure the engine is earthed to the chassis & battery - that may be your original problem...
    – Solar Mike
    Feb 18, 2018 at 19:59

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Your Tundra should have a Starter Relay, and it's likely in the main fuse block under the hood. I checked your Owners Manual but it doesn't look like they put the information in there. Fuse Locations are likely molded on the underside of the Main Fuse Block Cover.

As @SolarMike said, you should remove, clean, and tighten grounds and battery terminals. Check for signs of creature nesting, and carefully inspect wiring if anything is found.

YouTube has a video on testing a Toyota Starter Relay with a Multi-meter. While you have a Multi-meter, you should also test to be sure that your battery is charged (Above ~12.6V) You could also remove the battery from your truck, and bring it to a Retail Auto-parts store for free testing if you don't have a Multi-meter.

I'd highly suggest investing in one, though. They are very, very, helpful for numerous Automotive, and other, projects.

Disconnect the battery, and clean and tighten the Ignition Wire going to the starter.

If everything has checked out from there... The next step would likely be a Voltage Drop Test across the wires involving the Starter Circuit. Here is an explanation of how to perform a Voltage Drop Test and a different explanation here.

I hope this helps!

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