I have a 2004 toyota tundra and tried to engage the 4 wheel drive and it won't engage it just keeps blinking any ideas?

Blinking light means that the unit is trying to engage.
I've read that if the light is blinking and won't go out on it's own during engaging or disengaging, you can go underneath and tap the selonoid

Thread: 4 Wheel Drive just broke - Tundra Solutions

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Any Tundra owners had the blinking orange light 4WD problem

Four wheel drive actuator may me at fault, try park the truck on a slick surface like wet grass, set it in neutral and activate 4hi and 4lo back to 2wd a few times, if doesn't help try tapping on motor actuator located on transfer case while someone activates selector, park surface must be as level as possible, a good tip is to activate your four wheel drive once every few months to avoid it freezing up.If nothing helps then it needs to be diagnos by a tech. good luck

what's wrong with 4wheel drive when light blinks on 4hi other than not engaging

Your not all the way in to 4 Wheel drive. It will flash when you are not fully engaged. Refer to your manual it clearly explains it.

4 wheel drive does not engage on a 2004 toyota tundra

Does the 4wd icon on the dash blink when you try? The most common problem I have seen is the 4wd actuator sticking. Its mounted towards the rear of the transfer case on the drivers side(US). It has about a 3inch electrical plug on it. Locate it and with the truck running have someone push the 4wd button while you lightly tap on the actuator motor. They can sometimes stick from lack of use. If it doesn't free up it may need to be replaced which is rather involved. The transfer case would need to be removed and opened up to replace.
Good luck.

The light blinks to alert you that a problem exists in the control module for the 4X4, contact expert Toyota Ed he is the service manager of a Toyota dealer, he knows his stuff