pekwah1
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| posted on 29/5/11 at 04:08 PM |
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Engine not turning off.....
Hi Guys,
just a quickie, when i turn off my ignition, the engine keeps running.
It's a sylva striker with a 1300 xflow.
Now also when the engine refuses to die, it also still runs after i completely disconnect the battery.
So, i'm assuming it's running from alternator power alone, but how is this possible if the battery is unplugged?
My alternator actually is hooked up on the positive terminal for the starter so i'm guessing this might be travelling down the wires and somehow
keeping it live....
Suppose this would be easier if i just made a loom, but no i was lazy and bought it from raw instead.....
Cheers,
Andy
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ianclark1275
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| posted on 29/5/11 at 04:34 PM |
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correct the alt is powering the ignition.
trace live feed to coil back to the ign switch.
IC
measure twice, cut once, scrap it, start again.
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rusty nuts
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| posted on 29/5/11 at 04:38 PM |
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Sounds like there is still a feed to the coil positive when the ignition is turned off? Time to get the multimeter out and start checking, could be
the alternator is feeding back through the ignition switch? Disconnecting the battery with the engine running may damage the alternator so not a good
idea. What ignition switch are you using?
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stevebubs
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| posted on 29/5/11 at 05:12 PM |
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I would take the alternator directly back to the battery positive rather than use the starter connection.
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JAMSTER
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| posted on 29/5/11 at 05:13 PM |
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it could be that you cooling fan is running all the time?????????
i had a car that done this
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austin man
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| posted on 29/5/11 at 07:50 PM |
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definitely a live back to the ignition I have seen Rad fan , dynamo and alternator do this
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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BaileyPerformance
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| posted on 29/5/11 at 08:50 PM |
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quote:
Originally posted by pekwah1
Hi Guys,
just a quickie, when i turn off my ignition, the engine keeps running.
It's a sylva striker with a 1300 xflow.
Now also when the engine refuses to die, it also still runs after i completely disconnect the battery.
So, i'm assuming it's running from alternator power alone, but how is this possible if the battery is unplugged?
My alternator actually is hooked up on the positive terminal for the starter so i'm guessing this might be travelling down the wires and somehow
keeping it live....
Suppose this would be easier if i just made a loom, but no i was lazy and bought it from raw instead.....
Cheers,
Andy
Hi, a quick way to sort this problem is to install a diode in the alternator warning lamp wire (the small wire on the back of the alternator) Buy a 3A
diode from Maplin Order Code: QL81C, white strip on diode towards alternator. (must be right way around)
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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daviep
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| posted on 29/5/11 at 09:17 PM |
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quote:
Originally posted by stevebubs
I would take the alternator directly back to the battery positive rather than use the starter connection.
Why what's the difference?
Davie
“A truly great library contains something in it to offend everyone.”
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snowy2
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| posted on 30/5/11 at 07:05 AM |
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quote:
Originally posted by stevebubs
I would take the alternator directly back to the battery positive rather than use the starter connection.
Almost every car ever made uses the live feed to the starter as the connection for the alternator, it would not make the slightest difference to the
problem stated above moving it*. i suspect that the coil has a permanent live feed, rather than a switched one. The car continuing to run even after
the battery has been disconnected indicates this. If your car runs any sensitive electrical devices (electronic ign. electronic dash) disconnecting
the battery could cause a massive voltage spike which could kill them all, the battery acts like a voltage stabiliser. The alternator is also not
going to like it much either, and it could blow the regulator pack.
* besides it really isn't good practice to have numerous connections on the battery, ideally there should be only one live and at most 2
earth's.
[Edited on 30/5/11 by snowy2]
sometimes you are the pigeon, most of the time the statue.
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steve m
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| posted on 30/5/11 at 07:49 AM |
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But surely the ign + side needs to go throught the ign switch, thus key off means no + to power the coil ?
Also it seems that the ignition is ALWAYS on,
Well, thats how mine is done!
Steve
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omega 24 v6
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| posted on 30/5/11 at 11:24 AM |
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Feed back from the alternator. many of us have had it and the diode does cure it. Basically when the alt starts charging it puts a pos down the thin
w/light wire line ( so there is no longer an earth to make the light go on. When you turn the key off with the engine running this pos then goes
through the bulb and even with the resulting voltage drop ( the bulb being in series) sometimes there is enough voltage ( 3 to 5 volts or more) to
keep sensitve electronic ( read ecu) devices powered up.
If it looks wrong it probably is wrong.
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