runs with no battery
Thread Starter
|
Senior User
Joined: Dec 2005
Posts: 380
Likes: 0
runs with no battery
i was running my bII i noticed i knocked the cable off ( it loose cuase if i leave the cable on while it sits for a while it drains for some reason old battery i guess) and the engine didnt skip a beat the year is 1987 for some reason the battery light didnt light up ethier also all electical stuff works too i had no clue it would run with out a battery i knew older cars did but i figured the ecm and stuff would fail if the there was no battery imput this is pretty wierd could there be somthing wrong cuasing a short for somthing like this to happen or is the bronco II really that out dated that it just works with out a battery also shouldnt the battey light come on if the battery is missing?? lol i know the light it self works cuase its on if the key in on but the engine isnt any ideas??
Senior User
Joined: Jul 2005
Posts: 281
Likes: 0
If your alternator is working correctly, that appears to be functioning exactly as it should. The battery light will come on when the voltage drops below what it should be at, like when you turn the key on without the engine running, there is a draw to the battery, and no input voltage from the alternator. The alternator will provide the necessary current to run the efi, and also provide enough voltage that the battery light shouldn't come on, as it should be reading the voltage from the alternator, which is higher than the batteries anyways. I guess popping the cable off was just a good test that your alternator is in good shape.
Thread Starter
|
Senior User
Joined: Dec 2005
Posts: 380
Likes: 0
great thanks for some reason i though cars didnt run with out a battery i though ethier the battery was nessary for the compleletion of some vital circut of the alernator didnt make 14v D.C. but A.C. to charge the battery which we all know woulndt work with any of the motor components
"Mifflin Clay"
Joined: Jul 2005
Posts: 3,177
Likes: 4
From: Mifflin, PA
Originally Posted by RomerB2
Would it run without the negative? I've always thought a car won't run without the negative, but it can run without the positive.
Postmaster
Joined: Jul 2004
Posts: 3,624
Likes: 1
From: Bixby, OK
I guess it's always been in my mind ever since I was a little kid that it couldn't run without negative lol. It makes sense that if it runs without the positive it would run without the negative, but I haven't ever tried it.
Thread
Thread Starter
Forum
Replies
Last Post
1989 Mudwieser
1987 - 1996 F150 & Larger F-Series Trucks
23
May 23, 2015 10:33 PM
joshofalltrades
Electrical Systems/Wiring
16
Nov 5, 2012 10:17 PM
firetree
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
5
May 10, 2009 10:04 AM
yorxs
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
4
Aug 4, 2003 10:41 PM
