1990 Mazda MPV Dashboard lights go on

LEON1990

MEMBER
1990 MAZDA MPV
6 CYL
2WD
AUTOMATIC
195,000 MILES

While the engine is on, when I press on the accelerator, whether the car is moving or not, the "charge'" "rear light, " and the "Leveler" lights on the dashboard go on. When I step off the accelerator, the go off most of the time.

4 Replies

DOCFIXIT

MECHANIC
18,828 POSTS

Hi
Maybe a faulty diode in alternator a scope test of alternator will show if restifier bridge is faulty. Check alternator voltage output with meter see if voltage is steady as RPM goes up.
Let me know
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Tuesday, June 16th, 2009 AT 8:59 AM

LEON1990

MEMBER
3 POSTS

The alternator output varies very little. It goes up from 17.8 V at idle to maybe 18.5 V at 3000 RPM.

I may have neglected to say that everthing other than the dashboard lights appears to be working.

Thanks

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Tuesday, June 16th, 2009 AT 9:32 AM

DOCFIXIT

MECHANIC
18,828 POSTS

Alternator output out of range Mazda specs 14.7 to 15.5 at 3000. All the lights that come on have a diode in circuit to prevent current flow possible high out put has fried diodes. Allowing voltage to travel to lights.

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Tuesday, June 16th, 2009 AT 9:52 AM

LEON1990