I've got a problem and I'm hoping some Jeep fanatics out there have seen or possibly know whats wrong.
So this past weekend, I realized my fog lights were turning on by themselves via the multifunction switch (also controls signals, headlights, and highbeams), something was loose because I'd have to press and hold the switch to keep the fog lights from turning on (even when the car was off). Well, needless to say, my battery has drained overnight.
Well today, my brother came over and tried to give me a jump start, but our efforts have failed. I disconnected the bulbs from the fog lights to prevent them from draining the power from the jump, but that didnt work. I also took out the fog light indicator (which was permanently on in the dashboard when hooked up to my brothers car) in case that was draining the power from the jump, still no luck.
My brother's guess is the alternator or starter needs to be replaced. My question is if my battery drains, could that potentially affect my alternator or starter?
With a completely dead battery you need to leave the jumpers hooked up for a while to the "live vehicle" with it running in order to get some charge into the dead battery. Right now the dead battery is sucking up all the amperage. If you do this for about 10 minutes or so, it should work. However the best method is to charge the dead battery with a charger. If your dead battery is a couple years old, just replace it. When you kill a car batt that bad, you shorten its life anyway.
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89 yj 4 banger 5sp. 2" BL 31x10.50 fixed up and sold
97 tj 4.0 Auto 4"RC lift 33x12.50 mud rovers on outlaw IIs . Smitty bumpers
like parrot said a completely drained battery will take forever.. took my buddies rubi 20 minutes to charge..
my jeep started doing the same thing and it was a bad battery.. had a lifetime warranty on it through sams club and got a brand new one.. and it went bad too.. it could also be the battery terminals.. my jeep's need to be replaced, they are corroded and ive had problems with my battery keeping a charge because of it
99 sahara :: 2'' coils (front), jks acos f&r, jks front trackbar, jks bl/mml, RE monotube shocks, hp30/d44, 33'' procomp mts, 15x8 eagle alloy 187s, hella optilux fogs, raingler nets, & more random junk::
if its dead it'll take a while... also, are you hookin +to+ and -to- or are you going -to(grnd)? if its a stick shift, you could pop the clutch to start it and drive it aroudn for a little while, this should charge the battery
When a battery is totally dead, the alternator will be dead too. The alternator needs at least some voltage from the battery (called an exciter voltage) to work so if the battery's dead, the engine won't run once you remove the jump battery.
And you can't push start a Jeep with a dead battery either, for the above reason. Note I said 'dead'... because a battery that is simply too low to start the engine but not completely dead will allow a Jeep with an alternator to be push started and the engine will run.
Some alternators like, I believe, in GM vehicles don't require the battery to work but Jeep TJ alternators do.
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i think the battery was just old, either way it would not jump even when chargnign it for about half an hr and the FJ revving at 4k. With the new battery i havent had any problems yet. Once i had my jeep barely start because the engine light somehow got stuck turned on even with the hood closed.