What's Wrong with my Bronco?

Erkal · 07-28-2009, 12:18 AM

I have a 1986 ford bronco II, 2.9. If I have a fully charged battery or if I jump start it, it will start and run forever but after Running for a while, if I shut it off and try to start it again the battery will be totally drained. I have replaced the altenator which didn't fix it, and I have tried different batteries and same thing.
Some one please shine some light on this. I can't figure it out. Thanks.

alaskan155 · 07-28-2009, 12:54 AM

take a voltmeter to the battery and see if its around 14v,while running thats means the alternators working properly, if it says about 12v or less it could be the wiring or in the alternator somewhere

gertsdsbs · 07-28-2009, 01:14 AM

Mine did the same thing and it turned out to be the ground wire. it looked fine but the inside was all corroted. Good Luck!

TheCiscoKid · 07-28-2009, 03:05 AM

x2 on checking the wires, even if they look fine they can be corroded on the inside. Check their connections first though, then replace the wires.

JamesC · 07-28-2009, 06:48 AM

make sure you don't have a draw on the battery with the key off check for dome light staying on, stuff like that. Also as said check running voltage to see if it is charging, you can use a jumper cable as a temporary ground if you don't have extra cables lying around.

kroed11581 · 07-28-2009, 09:18 AM

My 88 did the same thing, turned out to be that when the battery cables were replaced, they routed them too close to the exhaust manifold, the cables would heat up and not conduct electricity down to the starter. For the cost to replace the battery cables, I'd try that first, making sure to route the cables away from extreme heat sources.

Erkal · 07-28-2009, 11:08 AM

Thanks every one I will take a look at all this and see if it works thanks

07-28-2009, 12:18 AM	#1
Erkal New Member Join Date: Jul 2009 Location: West Jordan, Utah Year: 1986 Make: Ford Model: Bronco II Eddie Bauer Engine: 2.9 v6 EFI Class: 4x4 Extreme Used For: 4Wheeling, Hunting, and Wilderness Exploration Posts: 4 Rep Power: 0 iTrader: (0)	What's Wrong with my Bronco? I have a 1986 ford bronco II, 2.9. If I have a fully charged battery or if I jump start it, it will start and run forever but after Running for a while, if I shut it off and try to start it again the battery will be totally drained. I have replaced the altenator which didn't fix it, and I have tried different batteries and same thing. Some one please shine some light on this. I can't figure it out. Thanks.

07-28-2009, 12:54 AM	#2
alaskan155 Member Join Date: Nov 2007 Location: Cheyenne Year: 1989 1999 Make: ford Model: Bronco II and f-150 Engine: 289/5.4l Class: 4x4 Used For: toy/dd Posts: 902 Rep Power: 7 iTrader: (1)	take a voltmeter to the battery and see if its around 14v,while running thats means the alternators working properly, if it says about 12v or less it could be the wiring or in the alternator somewhere __________________ 1999 f-150 5.4l/4r70w/3.55 4x4 ext cab pionner deck, 30 gig hd for music, cobra cb,cold air intake/tb space, cranked T-bars, LT265/75/r16 E tires 3" body lift 1989 Bronco II 4wd 67 289 /AOD/np208 unfinished 2003 Honda shadow ACE 750cc from the old board, missing the wrenches

07-28-2009, 03:05 AM	#4
TheCiscoKid New Member Join Date: Jul 2009 Location: Clayton, NC Year: 1984 Make: Ford Model: Bronco II Engine: 2.8 Class: 4x4 Posts: 28 Rep Power: 3 iTrader: (0)	x2 on checking the wires, even if they look fine they can be corroded on the inside. Check their connections first though, then replace the wires. __________________ Its only metal, it puts up a good fight, but in the end, it loses. -Cisco Kid Customs-

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07-28-2009, 01:14 AM	#3
gertsdsbs Member Join Date: Sep 2008 Location: On the Moon Year: 1986 Make: Ford Model: Ranger Engine: 2.9 v6 Class: 4x4 Used For: Picking up chicks Posts: 363 Rep Power: 4 iTrader: (0)	Mine did the same thing and it turned out to be the ground wire. it looked fine but the inside was all corroted. Good Luck!

07-28-2009, 06:48 AM	#5
JamesC Member Join Date: Oct 2007 Year: 1986/2005 Make: Ford Model: Ranger Engine: 350 chev/3.0 Class: 2WD Posts: 125 Rep Power: 6 iTrader: (0)	make sure you don't have a draw on the battery with the key off check for dome light staying on, stuff like that. Also as said check running voltage to see if it is charging, you can use a jumper cable as a temporary ground if you don't have extra cables lying around.

07-28-2009, 09:18 AM	#6
kroed11581 Junior Member Join Date: Jan 2008 Location: Hugo, MN Year: 1999 1998 197 Make: Ford Ford Jee Model: Ranger Explorer CJ5 Engine: 3.0, 4.0 304V8 Class: 4x4 Posts: 70 Rep Power: 6 iTrader: (0)	My 88 did the same thing, turned out to be that when the battery cables were replaced, they routed them too close to the exhaust manifold, the cables would heat up and not conduct electricity down to the starter. For the cost to replace the battery cables, I'd try that first, making sure to route the cables away from extreme heat sources.

07-28-2009, 11:08 AM	#7
Erkal New Member Join Date: Jul 2009 Location: West Jordan, Utah Year: 1986 Make: Ford Model: Bronco II Eddie Bauer Engine: 2.9 v6 EFI Class: 4x4 Extreme Used For: 4Wheeling, Hunting, and Wilderness Exploration Posts: 4 Rep Power: 0 iTrader: (0)	Thanks every one I will take a look at all this and see if it works thanks

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