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Randall C
Randall C, ASE Certified Technician
Category: Toyota
Satisfied Customers: 12890
Experience:  ASE Master Technician, 32 years, diagnostic/repair / electrical specialist
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My 2006 Toyota tundra will only start when jump started. I

Customer Question

My 2006 Toyota tundra will only start when jump started. I can drive it once started, however I have to keep the rpm's up otherwise it will die and not start again. the battery appears to be charged, but it will only click and not turn over. Is the problem the alternator?
Submitted: 2 years ago.
Category: Toyota
Expert:  Randall C replied 2 years ago.

Hello, when you say battery appears to be charged, when it shuts off and does not start, what happens when you turn everything on like wipers, headlights, brakes, blower etc, does anything not work or work slow? do you happen to have a volt meter

Customer: replied 2 years ago.
The windshield wipers, radio etc works but it doesn't start. Rpm's also are also low if at idle for a period of time before it dies.
Expert:  Randall C replied 2 years ago.

Need to reword, I had asked if you have a volt meter and,, when you turn everything on? everything you can , blower, wipers, headlights and all, does anything work slow? I realize you say battery seems ok, I am trying to confirm the battery is fully charged, This test with the truck not running and NOT starting, Hope this makes sense

Customer: replied 2 years ago.
My voltage meter reads 10.6 volts. The windshield wipers do appear to be working slowly.
Expert:  Randall C replied 2 years ago.

ok, can you get it running and volt meter ready, this is good as I can confrim what the problem is, If you can get running, put the meter leads on the battery terminal, I need the volt reading with engine running, even if you have to hold gas a little higher, Can this be done?

Customer: replied 2 years ago.
it will take a minute.
Expert:  Randall C replied 2 years ago.

no rush

Customer: replied 2 years ago.
The voltage meter now reads 14.2 volts At a little over 1 Rpm's
Customer: replied 2 years ago.
I'm not sure if I sent this but the voltage running at a little over 1 Rpm's is 14.2.
Customer: replied 2 years ago.
Randall are you still there? Did I answer your question?
Expert:  Randall C replied 2 years ago.

I am here, just wrapping up another customer. back in 2 min

Expert:  Randall C replied 2 years ago.

14.1-14.2 means the charging system is 100% working., You need 13.8-14.5 volts when running to show charge output, You have that. so, what is happening? your battery is not accepting nor holding a charge, meaning, weak/bad battery, Yes, I know things work like radio etc BUT, high amp draw items like starter? not enough battery amps to power the starter, It sis not running 100% as the computer must see minimal volts OR the computer cant control certain things, Iam 99% you need a new battery, Yours in not taking or holding a charge to 12.2 volts, yours is dropping to 10.6 etc.