chrisg
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| posted on 27/6/09 at 03:11 PM |
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Wiring for reverse
Now then.
I need to wire up my reverse which is basically a car starter motor. I want to operate it via a dash mounted push button switch but hopefully without
long runs of heavy cable. I presume the answer is a relay of some kind but me and mr electric are not on speaking terms - I can just about wire a
plug!
Any ideas welcome 
Cheers
Chris 
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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Phil.J
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| posted on 27/6/09 at 05:26 PM |
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You are going to have to have a heavy cable from the positive side of the battery to a starter solenoid adjacent to the motor, and a heavy cable from
the other side of the solenoid to the motor. Assuming that the motor is already earthed through the chassis, you just need to wire the push button on
the dash to give a negative feed to the isolated solenoid.
Take this feed from the neutral light output from the gearbox, This way there is no chance of accidently pushing the reverse button while in a forward
gear! You then just need a positive feed to the solenoid from a live on the fuse box.
[Edited on 27/6/09 by Phil.J]
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adithorp
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| posted on 27/6/09 at 06:15 PM |
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I assume your useing a pre-engaged starter. In which case you run a main feed cable from the battery to the starter. Ensure your starter is well
earthed to the chassis (run an earth strap if needed). Then you take a trigger wire from your button to the small terminal on the starter. The starter
solenoid both engages the starter gear and switches the main feed.
You might want to feed the button via a relay triggered by the neutral light to ensure you don't engage reverse while still going forward.
adrian
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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FEZ1025
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| posted on 27/6/09 at 06:35 PM |
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Don't want to muddy the water BUT the starter motor is going to take a big draw from the battery, would it also not be sensible to add a further
condition/relay so that reverse could only be engaged when both in neutral & when the engine is running.
Alan...
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chrisg
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| posted on 27/6/09 at 06:55 PM |
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Thanks chaps
I done a little sketch
Would making the relay feed from the fusebox come instead from the alternator light satisfy the "engine running" requirement?
Cheers
Chris
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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FEZ1025
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| posted on 27/6/09 at 09:17 PM |
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Chris,
Not sure you're quite right, can you confirm how the neutral light is wired? does it go from a switched fuse, through the bulb, down to the
neutral witch & then to earth?
Also as a total OT aside, I'm currently working at your avatar's ground putting in a fibre optic cable.
Alan...
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chrisg
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| posted on 27/6/09 at 09:21 PM |
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If I recall, the switch is earthed when the bike is in neutral so the wire goes to one side of the light and there's a fused supply to the other
terminal of the light.
I'll have to make sure.
Be carefull with the hallowed turf!!
Cheers
Chris
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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FEZ1025
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| posted on 27/6/09 at 09:37 PM |
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So when in your diagram you say "earth from neutral light" do you mean teed into the wire thaty goes from the bulb down to the neutral
switch?
Alan...
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chrisg
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| posted on 27/6/09 at 10:08 PM |
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Yeah I think so........
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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FEZ1025
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| posted on 28/6/09 at 12:06 AM |
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That would work fine for the neutral side, the other one the engine running would just be my preference & might not be necessary. You could take
the power from a switched fuse, that would at least ensure the ignition is switched on, but the engine still wouldn't have to be running.
I've done this in the past & trying to remember how, it's late & the whiskey is having some effect. it involves a changeover relay
put into the circuit for the charging light. When the ignition is switched on the relay makes one way, breaking the circuit for the starter, once the
alternator starts to charge the relay drops to the other set of contacts allowing the starter button to function.
That makes sense to me now, but might not in the morning.
Alan...
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James
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| posted on 28/6/09 at 01:32 AM |
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In situations when I've broken down or run out of petrol I've driven my Golf quite a long way on just the starter. To get out of the way
of traffic or whatever.
With a car as light as a BEC (even with Chris in ), for short work, I'd have though it didn't necessarily need the engine running.
Cheers,
James
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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FEZ1025
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| posted on 28/6/09 at 08:46 AM |
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quote:
Originally posted by James
In situations when I've broken down or run out of petrol I've driven my Golf quite a long way on just the starter. To get out of the way
of traffic or whatever.
With a car as light as a BEC (even with Chris in ), for short work, I'd have though it didn't necessarily need the engine running.
Cheers,
James
As I said this is my preference & might be not be required, without hi-jacking Chris's post it would be good to hear other people opinions.
I "think" the situation you describe is quite different in that you were using a car battery & here is an assumption, I assume most
BEC's run a bike battery. Somebody a lot cleverer than me will be able to say how long a bike battery will run a car starter, I suspect not too
long.
But as I say this is all assumption & preference it may not have any relevance based on fact.
Alan...
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chrisg
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| posted on 28/6/09 at 10:52 AM |
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quote:
Originally posted by James
In situations when I've broken down or run out of petrol I've driven my Golf quite a long way on just the starter. To get out of the way
of traffic or whatever.
With a car as light as a BEC (even with Chris in ), for short work, I'd have though it didn't necessarily need the engine
running.
Cheers,
James
I'm going to kick your ass!
It's started to get complicated 
Cheers
Chris 
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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