What is the difference between 12v high current 12v low current thank you John.

the current draw will depend on the load on the motor so low gear (1st) will be a lot less that high speed (5th gear)
however on a 500 cc amp battery, with trolling it shpuld be around 5 amps

Hi Jonathan, I think you may have forgotten that when the head lights are on so too are the marker lights and the number plate lights. It would also be unusual to have those lights turned on without the engine running. In other words you need to know what other units are consuming power. Oms law will be how to work your problem out. Regards John

yes
voltage to the coil should be 12 volts on start and 7.5 volts on run
with power the inverse applies --higher voltages the lower the current or the lower the volts the higher the current
recheck the installation or get an accredited auto electrician do it for you

it is possible that you have a blown fuse, HIGH & LOW beams are usually on different fuses, most likely for safety reasons so as if either one blows at least you still have lights, check the fuses in the fuse box......hope this helps......cheers.

Check for bad ground for low beam and bulb.

Also, check that the high beam works independently of the low beam for that mode.

The resistors provide resistance in the circuit, dropping voltage to the blower motor to slow the motor speed down. On high, the blower receives full voltage through the blower relay.

If you had High but no other speeds, then the resistor pack is usually the culprit. If you have all other speeds but high, the most common problem is going to be the blower motor itself, relay, or the switch panel.

You can check this by turning the fan speed to "high", unplug the blower motor, and check to see that you have roughly at least 12v at the plug. If you have 12v, that means the switch panel is activating the relay and the relay is working. Over time, heat kills the magnetic properties of the magnets inside an electrical motor. Without enough magnetic energy, you may not get enough opposing force to spin the rotor full speed when the windings energize, but still enough to spin at lower speeds.

Another thing you can check is the connector at the blower motor and the switch panel. Sometimes these will heat up, start to deform, and cause a bad connection. The bad connection may be able to handle the lower current draw on low speeds, but the higher resistance from the bad connection won't be able to handle the higher current while in the full speed position.

Hope this helps, keep me posted. be glad to help you get your heater working again soon.

renew element

This could be a few different things:

1.Check the power and ground connections on your blower motor, corrosion can cause high resistance and a slow blower speed.

2. Check your available voltage at the blower motor on the different settings. it should vary with high supplying 12volts, make sure to do this check with the blower motor still plugged in.

3. Connect the blower to a 12v power source and see if it runs at high speed.

If all else fails i would check your resistor pack, i would not suspect this because when it fails you usually just loose all speeds except for high, but it could happen.

I'm not sure whether the high or low side of the field is controlled; typically, it is the low side with 12V applied to the field and the low side controlled by a a transistor in the ECU. If you are measuring 12V at a field terminal, it may be normal and when I have monitored this voltage on the controlled side, it was always lower than 12. I can't give you a range because ot the variation of load on the output.
If you measure the resistance of the field winding, you can get a rough idea of the current it draws. For example; measuring 100ω would yield a max current of ~120mA. ( I=E/R)
I have something in mind about 200ω but that seems too high but it should be in the range of ~100 - 200ω.