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Car Forum / Mazda / Mazda Miata / August 2005Battery light constantly on
One day the light stayed on. Checking charging voltage, had a tad over 15 volts and climbing so had the brushes and regulator replaced. The mechanic claimed it wasn't charging at all when he got it, and that after changing the brushes and regulator it worked properly (range 14.4-15.2 is normal he says). HOWEVER, the battery light stays on still and he wonders if perhaps he should of changed the diode pack even though it tested okay. Anybody have any ideas why the battery light stays on? Cheers Mike PS - if replying directly, please remember to remove "nospam" in my email address When I picked up the car the mechanic advised he pulled the alternator again and replaced the diode pack and the battery light still stays on. I checked the charge voltage and it is normal now - 14.4 to 14.7 volts so I'm happy that way. But what about the light??? He suggested use some black electrical tape.............. yeah right!! > One day the light stayed on. Checking charging voltage, had a tad over 15 > volts and climbing so had the brushes and regulator replaced. The mechanic [quoted text clipped - 9 lines] > PS - if replying directly, please remember to remove "nospam" in my email > address What year is your car! 99 on Miatas have the regulator as part of the instrument panel electronics, not built into the alternator. Yes, a bad (leaking) diode pack can cause a conventional alternator light to be on, usually not at full brightness. > One day the light stayed on. Checking charging voltage, had a tad over 15 > volts and climbing so had the brushes and regulator replaced. The mechanic [quoted text clipped - 9 lines] > PS - if replying directly, please remember to remove "nospam" in my email > address This is for a 1990 MX5. I checked the diode pack with a DVM and both the main diodes and the "trio diodes" (that's what the mechanic calls it anyways) check good. Not often are diodes intermitent, so I really don't know what is going on here. I believe something is going on the neither the mechanic or I have caught on to. Geezzzz :( Mike > What year is your car! > 99 on Miatas have the regulator as part of the instrument panel electronics, [quoted text clipped - 15 lines] > > PS - if replying directly, please remember to remove "nospam" in my email > > address This is gonna sound dumb--but are the rear lights functional? Our 89 MPV had a sneak circuit intentionally built in to set the battery light on if a rear bulb was bad. > This is for a 1990 MX5. I checked the diode pack with a DVM and both the > main diodes and the "trio diodes" (that's what the mechanic calls it [quoted text clipped - 29 lines] > > > address My rear lights aren't on in the day time, and the front running lights (Canada) are okay. I never checked to see if the bulbs in the tail likght are actually good. I can't see them having a suffisticated bulb monitor circuit like that that would detect a bulb being defective even if the power is not being applied. But I should try disconnecting the battery for 1/2 hour and then see if that fixes it. After that, if still no joy, guess I might phone a Mazda dealership in the adjacent city. > This is gonna sound dumb--but are the rear lights functional? > Our 89 MPV had a sneak circuit intentionally built in to set the battery [quoted text clipped - 39 lines] >> > > address |
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