It has been cold enough here in the desert to cause activation of the grid heater. It is also warm enough in the afternoon to use the AC. I have noticed if I leave the AC on and the blower my truck will start to crank then stop, kinf of like a low battery. Turn off the AC and it fires right up. MY question is this normal or do you think I may have a battery going down. I was hoping someone might give it a try and let me know if perhaps both on at the same time may be too much draw on the batteries. The amp meter reads 14-15 when running. My truck is a little over a year old and well maintained.
If you have the time...Thanks

 

Someone? I just need you to try and start your truck with the grid heater on and the ac and blower motor.

 

THATS NORMAL ...your saying when you start the truck with the ac on high ...the blower fan goes ~HI~LO~HI~LO... the alt.doesn't kick in for a few to 20 seconds after starting

NO WORRIES !

 

THE COMBINATION ...GRID HEATER STILL CYCLES After start (heavy draw)and the blower, and the alt not kicking in yet ...its normal

 

No, it begins to crank and then stops. It will not turn over enough to start the engine. If I turn off the AC, it cranks fine, starts, and runs fine.

 

That's not what he's asking.

In our trucks, when the defrost is on, the AC is on. I start mine every now and then with the defrost on in temperatures where the grid heaters are active, and it turns over fine. I usually turn everything off if I see the WTS light on, just in case.

What you're experiencing doesn't sound normal to me.

 

Thank you!

 

You probably need new batteries.

Merrick

 

Batteries have always lasted at least 2 years for me. I will see what the dealer says about the prorated warrantee.

 

I think they had an update for this complaint.
There maybe a flash calibration to turn the A/C compressor of when cranking/starting.

 

Thanks for that info. I will add that to my questions. I hope my AFE dos not void my battery warrantee. :>0