Starting Problems

I posted here a few weeks ago and you guys helped me zero in on a axle leak that was causing driving issues so I am hopeful someone may have some insight on a starting issue.

I have a '99 SR5 with about 160K miles and occasionally I have problems with it starting. It's been happening for a few months now but the problem is noticeably worse when the temps are very cold.
When I turn the key to accessories, everything turns on just fine and when I turn the key again star the engine I get a hear a click and then nothing happens. The click does not continue. It just clicks once and then silence and there is no change to the accessories being on.
When I had the axle leak fixed a few weeks ago my mechanic was convinced the starting issue was due to a corroded battery terminal. I replaced the corroded terminals with brand new ones but the starting problems continue.
The problem seems very intermittent. I was at a ski resort yesterday and after sitting most of the day the car started just fine in the afternoon (temps were in the 20s all day). After warming up for 5 minutes I had to run back inside so I turned the car off. I returned about 25 minutes later and then it wouldn't start. It probably took 3 attempts at turn the key before it started.

The only other issue that may be related is what may be a power issue. If I am stopped at a light with heat on full, it seems ok but when I hit the gas and start going I can hear the heater putting out more air. I thought maybe this would indicate a spark plus issue and maybe related to the starting issues.
 
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How old is the battery?

Is the alternator operating properly?

Are the wires for the chassis and motor grounds in good shape?
 
Mine has been acting up recently as well.... Had the same issue with my FJ62 and the contacts cleared up the problem.

Turn the key and half the time nothing happens. Other half the truck starts right up like nothing wrong. Battery and charging system check out just fine.

Guess I'll be ordering some parts!
 
The only other issue that may be related is what may be a power issue. If I am stopped at a light with heat on full, it seems ok but when I hit the gas and start going I can hear the heater putting out more air. I thought maybe this would indicate a spark plus issue and maybe related to the starting issues.

Your battery voltage will vary from low idle to high RPM. Or you may be hearing your fan clutch kick in... Can you actually detect the air blowing harder from the vents or is it just a sound difference? You may be confusing the sound with something else.
 
Sounds like your starter is starting to go. Mine did the same thing until I replaced the starter with a rebuilt denso. I know the contacts are much cheaper but I was leaving town for a few days and didnt have time to order the contacts. Just a heads up, removing the starter is a gigantic pain in the ass.
 

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