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Amp gauge wiring

R

rrlund

Well-known Member
I don't know why I can't get this through my head. Somebody put new gauges in this Oliver 500/David Brown 850 and didn't hook up the amp gauge. To top it off,they took the old starter button off and put on a solenoid and key switch.
The diagram shows one wire from the + on the generator. Mine doesn't have a + stamped in to it. Just D and F. F I know is Field and D is dynamo,or generator. Any idea which one of those two would be the + ?
The one to the starter would just go to the wire that hooks to the same post on the solenoid that the battery cable hooks to wouldn't it?
When it comes to electrical wiring,my eyes glaze over and my mind goes blank.
a188004.jpg
 
Replacing a push button with solenoid and switch is not a bad idea, the push buttons are getting really crappy, you can also interlock the key with the starter that way.
 
(quoted from post at 16:12:48 04/02/15) I don't know why I can't get this through my head. Somebody put new gauges in this Oliver 500/David Brown 850 and didn't hook up the amp gauge. To top it off,they took the old starter button off and put on a solenoid and key switch.
The diagram shows one wire from the + on the generator. Mine doesn't have a + stamped in to it. Just D and F. F I know is Field and D is dynamo,or generator. Any idea which one of those two would be the + ?
The one to the starter would just go to the wire that hooks to the same post on the solenoid that the battery cable hooks to wouldn't it?
When it comes to electrical wiring,my eyes glaze over and my mind goes blank.
a188004.jpg
Click to expand...
D" is your "+" and yes , as you said, on starter wire connection
 
(quoted from post at 16:45:45 04/02/15) From the diagram D is the magneto kill switch not a positive feed.Does the 500 have a magneto?
Click to expand...
D" on his generator. Not "D" on diagram.
 
D in the diagram is,yes,but on the generator itself is stamped D and F,not + and -. D is dynamo,the British term for what we call a generator,so it would be generator and field. It has a distributor,not a magneto.
One other question though. The way that somebody has it wired now,there's a wire going from the regulator to the battery post on the solenoid,so do I just run from the gauge to the regulator,or to that post?
All of the old wiring has been stripped out and they've rewired the whole thing. Or at least attempted to.
 
The diagram has issues. Your tractor seems to have a voltage regulator. From the VR to the Generator should be a F wire from F to F. 12 gauge works. From D to D is 10 gauge. From the regulator output terminal, a 10 gauge wire should go to a Fuse link (about 35 amp) from the fuse link (or heavy fues in holder) the 10 gauge goes to the the amp gauge. At that terminal of the amp gaugea wire goes to the lights and other accessories (12ga). from the other amp gauge terminal a 10ga. wire goes to the starter relay (solenoid) and attaches to the big terminal connected to the battery cable. If it is an alternator with regulator same answer. If alternator, with internal regulator skip the regulator info, and go from D to fuse link. Jim
 
Just curious, is the regulator or cut out attached to the generator? Wondering if the gen you have is original or needs a regulator? Could be why it's marked different.
 
It's a generator. Just to add to the rats nest,they've put a fuse panel on it too with the newer style spade fuses and did away with the original light switch and installed one with rocker switches. I bought a new correct light switch for it,so I have to figure out where all the wires need to go to that too.
They did do a nice job of wrapping tape around all the new wires,so I'm going to have to cut all that off to figure out where it all goes.
This British terminology doesn't help. The wires on the regulator are stamped D E A and F. Dynamo,earth,armature and field?
 
It had the original Lucas regulator mounted up under the dash. The starter shop managed to get me a new one that's identical since we had no way of knowing if the old one was good or not. There are four wires marked D E A and F.
 
rrlund,If you run the wire that is going to the battery post on the solenoid from the regulator hook that wire to the amp gauge on one side.Then run a wire from the other post of the amp gauge to the battery post on the solenoid.Start and check the gauge for correct charge deflection.If is shows discharge when running,swap the wires on the amp gauge.
 
From what I'm seeing, D to D, F to F, E to ground, A to ampmeter.

http://matchlessclueless.com/electrical/how-it-works/lucas-voltage-regulator/
 
There's one thing I haven't figured out though. There's a wire bolted to the engine front cover and sticking up under the generator. It has a spade end on it and appears to be factory. I'm thinking it's a ground,but neither I,or the folks at the starter shop know where it might hook up. I wonder if it was hooked to the generator somewhere,or if it ran up to the regulator? The wire that's hooked to E on the regulator is bolted to the cowl. It seems to me it would make a better ground at the engine,less chance of rust and corrosion,but I don't know?
 
I suspect that was the original ground wire, the diagram shows it connecting there at the generator. You can ground the regulator to the cowl as long as it's good and clean and through bolted, not a sheet metal screw. I prefer to ground the battery directly to the engine, then ground the body/cowl to the engine.
 
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