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I've got a '98 D with the 318ci in it. I bought it about a year ago and ever since then especially in cold weather, if I let it sit for a day or two without driving it, it won't start and I need a jump. So far, I've had the mechanic do a draw test to see if anything is drawing current, he said no. I've tried two different batteries from two different stores and two different brands.
A guy told me something about a diode in the alternator that will draw current with the engine off, something like a flash diode I believe he said. Does anyone know what it could be.
BTW...I took the cable off the battery and the truck still ran. I have to give the kids a ride to school in the morning here in Wisconsin, it's cold as hell and the problem is getting worse.
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I'd have the alternator checked. it is possible for one of the alternator phases to go bad. the remaining two will run the vehicle, but limit output so that there's nothing left to charge the batt, especially when you have to run lights, wipers, heater blower, rear defrost , etc on those cold winter mornings, thus slowly draining your batt.
also make sure you have good, tight, corrosion free connections everywhere.
I don't use the remote key locker or the lock all button inside the cab....I manually push down the locks then close the doors. This prevents the alarm from activating...at least the security light doesn't come on, so it looks as tho it's working. I then use the key to open the driver's door.
Well...I'll have to wait until I don't use the truck for a day....which shouldn't be long. I don't do that much driving since my back went out. I'll let u know what happens after it sits...but so far it's been starting up with no probs.
I am having the same problem... I let my truck sit from last night at about 5pm till now and its 3pm the next day and the batt is dead... IDK what the hell is going on... Ive tried to do everything. Im bringing it into the shop now.... This needs to get worked out cuz i need it to be dependable and plus a have a Brush Guard and 4 Foglights on there way so i need the electric system to be strong.