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I have a 1994 f-150 pick up got a new battery & when i put the heat on it discharges & now truck won't.

I got a new battery and now when I pu the heat on it discharges. The battery is being drained.

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  • carole r. Jan 08, 2013

    see my lastest comment.

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  • Cars & Trucks Master
  • 5,341 Answers

You mean with the engine running? If the engine is running, the heater fan should be getting power from the alternator, not the battery. Does your battery light go off after engine is running? Or does the voltage gauge show normal charging when running?
If you can start the truck, have your charging system checked out. If it won't start now, have the battery charged up and try again. Then have the charging system checked. If it is good, your heater fan may have a short and drawing too much current, But a heater fan will run the battery down pretty quick, if the engine is not running.

Posted on Jan 06, 2013

Testimonial: "yes! when the engine is running the alternator discharges. I also just got a new alternator put in last month. Battery light goes off after truck started. If the heater is running with truck running the gauge will stay on the "m" part showing charging. Now my new battery is discharged and think that it has to do with the starter. Which shows it has a solenoid on it. So, do you think that the heater fan is the problem for my short? "

  • 4 more comments 
  • carole r. Jan 07, 2013

    I meant when my truck is running & the heat is on it shows gauge for battery is discharging.

  • montehammons Jan 07, 2013

    Well, maybe not, if alternator charges with heater fan on. But something is draining battery, or the battery is not getting charged up, which could be a poor ground. Check and retighten battery ground., engine to frame ground, engine harness ground, and see if alternator has a ground. Also check that starter connections are tight.

  • montehammons Jan 07, 2013

    Oh, just read your last. Then yes, I would test the heater fan or suspect it of having a problem.

  • carole r. Jan 08, 2013

    well i had to change the starter and then my truck was able to start up. but i will have to check out the heater fan. cause with that on when the truck was running it showed discharging. so i shut off the heater fan & needle went back to the charging side.

  • carole r. Jan 08, 2013

    see prior comment. thanks!

  • montehammons Jan 08, 2013

    Yes, sure sounds like the heater motor has a short. A broken wire or short in the wiring would likely blow the fuse, so it does sound like the motor.

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I would replace the startor motor. That is quite common of draining the battery if its faulty.

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You have a bad typical connection hence the code, you are mainy going to have to troubleshoot this one on you own Chevy are popular for good looking wire connection and poor contact especially on the coil area just wiggle the connection and have some one crank it and it will start then wiggle it again and it will stall out, 1351 here is the definition Ignition coil high circuit input what this means is your are internaly disconnected you will need a terminal repair on the ignition coil this is a typical failure on the connection

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SOURCE: GMC 2000 sierra pick up 1500 sounds like it wants

It sure could be. But, first...by "won't turn over" you do mean it cranks at normal speed but won't start?
A simple test of the fuel pump is to stand by tank and listen as someone turns key to on. When first turned to on, your pump will activate for 2 or 3 seconds, pressurizing the fuel system, and then shut off if the engine computer doesn't get a cranking signal. Do you hear it come on? If not, then something's not turning your pump on. If you can hear it buzz on briefly, then maybe it's your filter. Another test: Spray a little starting fluid into your intake manifold (remove the big hose going into intake manifold) while someone tries starting it.If it doesn't fire and try to stay running, then it's probably an ignition problem. But if it does fire off, then you know it's a fuel problem-likely your pump or filter. good luck.

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SOURCE: 2003 Chrysler Town & Country, put in new alternator, now have 2 lights on including battery and one looking like a pump. Radio won't work.

Hello
The reason the battery light is on is that the charging system voltage is below the battery voltage, this means the charging system is not working correctly, since you already replaced the Alternator for I assume the same problem, unless you got a defective rebuilt (which is poss if bought from Autozone or one of the other discount parts stores) the charging system problem is not the Alternator but lies elsewhere in the electrical system. Use a volt meter and check the voltage at the battery cables with the engine running at high idle (at least 1000 RPM) the voltage should be at least 13.4 to about 14.2 Volts DC. This is also most likely the cause of the light that is on that you say looks like a pump due to the low charging system voltage. As to the radio it is in theft lock, this happens anytime the battery is disconnected, you will need to enter the unique security code for your radio, if you are not the original owner this may be a problem, as the little card with the code and the instructions to enter it often gets misplaced. You will likely end up at the dealer who can access the Chrysler factory computer and retrieve the code, there may be a charge for this.

Posted on Nov 30, 2011

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