Car Starting Problems
Car Batteries

What could be the problem 1990 bronco unable to start have replaced the battery and the relay next to the battery no lights inside trk when battery is reconnected?

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2008-09-21 12:06:42
2008-09-21 12:06:42

What is inside a battery ? Rocky_B - See my entry here for more things you might want to check: http://wiki.answers.com/Q/What_could_be_wrong_if_the_battery_light_stays_on_and_the_battery_still_runs_down_on_a_1996_windstar_after_installing_a_new_battery_and_alternator

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the bronco needs to have the ground wire connected from the battery to the body. if you replaced the battery and disconnected that ground it simply won't start.


battery hooked up backward, wires crossed somewhere or it could be the solenoid.



does your bronco have an external voltage regulator if so i would take it and have it checked


I replaced the drivers door switch on mine and it took care of the problem


There is the FULL SIZE BRONCO and then the Bronco II ( the Bronco II is smaller , eventually replaced by the Ford Explorer)



Are you sure the battery has enough juice (13.5volts)? Is the engine locked up? Try turning the motor by hand. If the engine is not seized, take the starter off and bench test it. Recheck your negative battery cable, a very good chance your problem lies there. The same thing happened to my 1995 full size bronco today. I took the battery cables off cleaned each one, and still the same problem. I replaced the starter, solenoid, finally noticed my ground wire from my intake to the fire wall was charred. So I checked my lower battery cable connections and my ground was not connected. I replaced my firewall ground and replaced my battery ground wire and all my problems were solved. Even my dash readings were fixed, I always had crazy readings on my dash (temp, oil pressure and amp gauge) all were fixed with the installation of my new ground wires.


The Bronco II was made till 1990. The it was replaced by the Explorer in 1991.


My 91 Bronco did the same thing before I found a crack in the passenger side exhaust manifold. Replaced with 50 state smog legle headers and a new O2 sensor and fixed the problem.


Under the hood, behind the battery




Your battery is being drained by a short to ground ,SOMEWHERE. Easiest way to find this out for sure , without a test meter, is to disconnect the Positive battery terminal when you shut down engine. Then see if it starts the next day.



try to disconnect battery for 30 seconds


Replace turn signal switch. Its grounding when you put turn signals on. I had the same problem and replaced it .Solved issues.



Disconnect the negative battery cable for a few minutes...that will reset the light and the computer memory. If there is still a problem, though, the light will come back on.


Disconnect battery, follow the users manual disconnect wires from the starter, detach bolts remove the starter. To install the starter, follow the reverse process step by step to ensure its completely and correctly replaced.



to my knowledge the bronco is an automatic, so you dont have a flywheel. you have a flex plate and ring gear.need to know why you want to replace this


No, the gears are stamped as part of the regulator arms. If the gears are bad the regulator unit would need replaced. More likely a problem with the gear on the motor. I've never seen the motor gear offered separately. Motor would have to be replaced.


hi, all you have to do is fit it no problem oli


Take it to your local auto parts chain store. Most of them will check your battery and alternator for free.



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