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May be but I doubt it. The alternator is not putting enough power to keep the light out. IT works like this battery power (12 volts) flows through the light to the alternator and puts it on when the alternator starts to charge the extra voltage from the alternator (14.5 volts) flows back through the light and as the 2 volts difference is not enough to make the light work it goes out . IF you are measuring 12 volts at the battery and 12 volts at the alternator then then the alternator is not charging. What you should have is 12 volts at the battery and as you rev up the engine the voltage should increase at the battery up to 15 volts maximum at around 2000 RPM
charging lights work on the principle of a balanced current throughn the bulb. no charge and the current flows from the battery through the bulb to the alternator. conversly when the alternator is charging at 13.5 volts or better the current is flowing back through the bulb. this opposing current puts out the bulb 12 volt batteries arte in fact 13 volts and alternators charge at 13.8 to 15 volts the 2 odd volts difference is not enough to make the bulb light up. Knowing this it means that some where you have an open circuit that is allowing I suspect battery voltage to make the bulb work. So I would be checking the wiring at the back of the alternator especially the continuinty of the 2 small wires in the connector as I suspect one may be broken in the platsic covering at the fitting The heavier lead is the one that carries the charge directly to the battery
is this 6 or 12 volt? also is this positive ground or negative ground? if you pull the starter and put it on a bench ( lets say this is neg ground and 12 volts) put red charger clamp on the post and touch the black clamp to the casing (where it bolts up) it should turn over. things would be hooked different if its 6 volt or if its pos ground
Either the brake light bulbs are faulty and needs replacement.But if in case the brake light bulbs checked out ok and the bulbs are glowing by connecting brake light bulb to battery directly ,then in that case the brake light switch is faulty and it has to be replaced./
Check for 12 volts at the terminal in the light socket when the brakes are applied.If there is 12 volt then its a bulb problem ,but if no 12 volt then its switch problem.The brake light switch located under the dash above the brake pedal.------------Keep updated for any more queries.Thanks.
If you are measuring this with a volt meter, you might be measuring a voltage with a VERY small current that could be coming from the pump motor magnet in combo with the plumbing and minerals in the water...but, that may not matter. To see if this is significant, hook up a 12V test light using an automotive interior light bulb or a turn signal bulb. Try it at night (or at least out of the sun) so you can see if you get a bit of glow. The current may be so weak that it cannot maintain even one volt across the light bulb filament, in which case you can disregard it. You can put your voltmeter in parallel with the test light to measure the voltage with the light bulb load in place.
If the light bulb does light up, then you have a problem. Please update this with where exactly you are measuring this 12V, and clarify if you are seeing this voltage only with the pump still connected to power.
are you buying the right bulb should be eather 3157 bulb if you use a 3057 they are wrong also make sure they are 12 volt light bulbs your sustem should be a 12. volt system and your alternator puts out apx 14 volts this is not enough to blow out a buld that can take 12.6 + volts you may have other issues
short in the wires will need a wiring diagram and ohm/volt meter to locate the problem, test lights work well to. you will need replace the fuse with a light bulb so that the power will not go away. and you will have to search for power going straight to a ground source. usually a raw wire from rubbing somewhere. can do a quick visual inspection first for the obvious, and then use the meter at certain points till you find a volt drop.