Ignition light

I have had the ignition light stay on at start up for some time now. It goes off once revved up a bit and stays off until the next start up.
I blamed the fact I had a diesel spill all over the alternator when changing the fuel filter.
I changed the alternator today for a 75 amp jobbie to boost my electrickery but the light stayed on as before.
A bit of mooching ont net and it seems the bulb on the charging system is an integral part of the circuit and trips the alternator into full charge mode and within seconds puts the light off.
I had changed the origional bulb for an upgraded LED light and this wasn't drawing enough power to exite the alternator into charge mode.
I put a standard bulb in and took all my clothes off, smothered butter on my genitals and spanked myself with a bunch of gladioli.
What was I thinking, LEDs in a trattor.

Bobsticle said:

I have had the ignition light stay on at start up for some time now. It goes off once revved up a bit and stays off until the next start up.
I blamed the fact I had a diesel spill all over the alternator when changing the fuel filter.
I changed the alternator today for a 75 amp jobbie to boost my electrickery but the light stayed on as before.
A bit of mooching ont net and it seems the bulb on the charging system is an integral part of the circuit and trips the alternator into full charge mode and within seconds puts the light off.
I had changed the origional bulb for an upgraded LED light and this wasn't drawing enough power to exite the alternator into charge mode.
I put a standard bulb in and took all my clothes off, smothered butter on my genitals and spanked myself with a bunch of gladioli.
What was I thinking, LEDs in a trattor.

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im using a led light and no problems, but im using a can-bus compatible led light, it tricks stuff into thinking there's a incandescent bulb still there,
will your old wiring if you do have old wiring take 75 amps, i want to up the size of alternator on mine but not keen as my wiring is as old as the car is.
Tony.

I can't see there being a problem. The old alternator was a 45 amp so the jump to 75 isn't huge.
I have just come in from giving it an hour on mixed roads and all was well. I have a voltage readout on the dash and rarely got it over 13 volts at the battery and now its a healthy 14.5. It is tipping it down outside so tried it with heater blower, wipers, dipped beam and side lights. The only time the voltage dropped was on full beam flash.
Even the wiper speed has increased. Happy so far.

Bobsticle said:

I can't see there being a problem. The old alternator was a 45 amp so the jump to 75 isn't huge.
I have just come in from giving it an hour on mixed roads and all was well. I have a voltage readout on the dash and rarely got it over 13 volts at the battery and now its a healthy 14.5. It is tipping it down outside so tried it with heater blower, wipers, dipped beam and side lights. The only time the voltage dropped was on full beam flash.
Even the wiper speed has increased. Happy so far.

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alright then, doesnt seem to be a problem then, as long as you dont have lots and lots of stuff on there running all at once then it should be fine as it'll only put back in what you take out basically, and of course charge the battery from when you started it.

kommer2013 said:

alright then, doesnt seem to be a problem then, as long as you dont have lots and lots of stuff on there running all at once then it should be fine as it'll only put back in what you take out basically, and of course charge the battery from when you started it.

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If I put anything heavy in I will use the origional wiring to throw a relay and run new wires to power it. A relay only draws a few miliamps so will use a lot less power than the loom was designed for.

What's your idle speed? I had dull/flickering ignition light on idle when I fitted a new alternator, turned out that the new alternator needed higher revs (later motors have an 800rpm idle) and the pulley was a bit bigger leading to it gearing down. Shouldn't be a problem unless you spend a lot of time on idle with the lights on but I upped my idle speed anyway as it is more comfy and doesn't seem to sup much

Idle speed is fine. A little high if anything. All is well now I have gone back to a standard bulb.

Even the cheap nasty fuel gauge I fitted is now reading spot on so that must have been suffering from low volts.