andyblack
Registered Loser
Was it HEI? I would think so if it was an original '85 305.
CK5
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Freaky One
- Thread starter Fordum
- Start date
Was it HEI? I would think so if it was an original '85 305.
rgorsuch87
1/2 ton status
The 3.8L V6 in Fords are the same way. Not sure about a 5.0 atleast I haven't seen one yet.
79bonanza
1/2 ton status
yea it was HEI but would that make it run with no battery in it at all
Alternator! I've donated one or both of the batteries in my K5 to jeeps while offroading before to get them off the trail. My 6.2L's CS144 has no complaints running the engine and my communications equipment. The lights get a bit dimmer, but no big deal.
79bonanza
1/2 ton status
yea but how do they get ground, i mean all electrical system have to have ground to work
Without the battery ground? There are tons of grounds all over the chassis.
Having said that, my stock '77 didn't like running without an alternator. It did it but all sorts of stuff was weird, basically it ran the truck but nothing else ran right (wipers barely moved, most gauges didn't really work, etc).
I know there are vehicles that will run without the battery there with no real issues.
chulisohombre
1/2 ton status
i have msd 6a ignition and mine wont run without a battery connected.but my buddys stock 69 gto will.it depends on the demand put on the whole system if it will run and stay running.
Almost all vehicles will run without their battery, the alternator supplies the electricity. Although you shouldn't really do it, the battery acts as a regulator is what I have been told.
You could go outside right now and disconnect the ground from your battery with your engine running in your truck, and it would stay running.
Martin
The alternator becomes the ground reference when you pull the battery. It outputs a voltage between its output and the case.
BUT just don't do it on a modern car. On an old points style system, a brief 18-20 volt or higher spike would not be noticed.
A computer would notice big time.
Among other things, the battery acts as a buffer and a load. The regulator on an alternator is not very "tight". For one thing, you are regulating a mechanical object.
As the voltage out begins to rise, the regulator starts reducing the rotor voltage. As the voltage begins to go above the battery voltage, it starts to draw current. The higher it goes, the more current it draws.
This sucks down the excess voltage and gives the regulator time to work.
Without the battery, if the car is not drawing a heavy load, there is nothing to limit the voltage.
All the regulator can do is reduce the drive, with little load, the excess electrons don't get used, and the voltage can go really high.
And that is if everything is perfect.
If you have an external regulator, and it's ground reference is slightly different from the alternator's due to a bad ground wire or connection, it might be seeing 14 volts while the alternator is putting out 30.
BUT just don't do it on a modern car. On an old points style system, a brief 18-20 volt or higher spike would not be noticed.
A computer would notice big time.
Among other things, the battery acts as a buffer and a load. The regulator on an alternator is not very "tight". For one thing, you are regulating a mechanical object.
As the voltage out begins to rise, the regulator starts reducing the rotor voltage. As the voltage begins to go above the battery voltage, it starts to draw current. The higher it goes, the more current it draws.
This sucks down the excess voltage and gives the regulator time to work.
Without the battery, if the car is not drawing a heavy load, there is nothing to limit the voltage.
All the regulator can do is reduce the drive, with little load, the excess electrons don't get used, and the voltage can go really high.
And that is if everything is perfect.
If you have an external regulator, and it's ground reference is slightly different from the alternator's due to a bad ground wire or connection, it might be seeing 14 volts while the alternator is putting out 30.
79bonanza
1/2 ton status
huh i always new you could run with no postive but i didnt think it would run with no negative, thats good to know. i do know that you shouldnt do this on a newer computer controlled car due to the battery keeping voltage spike from getting to the computer but besides that i hade never tried to run my truck with no negative.
If you have the positive cable unhooked from your battery, you might as well have the ground unhooked. It is the exact same thing at that point.
Martin
Martin
DEMON44
Low-Tech Redneck
some larger v16 diesels like the cummins QSK have 2 injection pumps. one on each side. bosch inline 8 pumps. works good.
and at one point couple months ago I was running my '90 diesel jetta 1.6l with no alternator for a couple weeks. it piled up threw the belt and I just didn't have time to change it. charge the batt every other night no sweat.
and at one point couple months ago I was running my '90 diesel jetta 1.6l with no alternator for a couple weeks. it piled up threw the belt and I just didn't have time to change it. charge the batt every other night no sweat.
