Hi,
Call for help from auto elec gurus out there.
I have 90 series Prado, 3lt diesel auto. It is fitted with a dual battery with second battery dedicated to starter. It appears to have random drop in voltage. When it runs at full 12v everything works fine, but when it drops (or seems to) then I get symptoms below:
Radio dies then comes imediately back, tacho needle drops to 0, electric windows will move slowly especially if more than one operating at a time, lights dim, interior lights dim, sometimes O/D Off light flashes (but O/D still works), sometimes ABS light comes on briefly.
The battery tests fine, as does the alternator, but symptoms rarely appear when car stationary. Belts are new. Sometimes hitting a bump will cause voltage drop, other times operating brake pedal or indicator, or high beam, or sunroof, or A/C will create problem. I think it's a voltage drop as it's like driving a 56 VW with 6v system at night when it strikes. When it's fine, then no problems with anything. It can be fine for days on end, then suddenly it will go off and symptoms come one after the other.
It doesn't seem to effect the running of the engine, indicators still work (probably dim but not been able to confirm) and A/C still operates.
There is an after-market alarm fitted, but don't see how that could effect electrics like this.
Any ideas on where to start looking? What could cause these symptoms?
Regards,
PaulS
Call for help from auto elec gurus out there.
I have 90 series Prado, 3lt diesel auto. It is fitted with a dual battery with second battery dedicated to starter. It appears to have random drop in voltage. When it runs at full 12v everything works fine, but when it drops (or seems to) then I get symptoms below:
Radio dies then comes imediately back, tacho needle drops to 0, electric windows will move slowly especially if more than one operating at a time, lights dim, interior lights dim, sometimes O/D Off light flashes (but O/D still works), sometimes ABS light comes on briefly.
The battery tests fine, as does the alternator, but symptoms rarely appear when car stationary. Belts are new. Sometimes hitting a bump will cause voltage drop, other times operating brake pedal or indicator, or high beam, or sunroof, or A/C will create problem. I think it's a voltage drop as it's like driving a 56 VW with 6v system at night when it strikes. When it's fine, then no problems with anything. It can be fine for days on end, then suddenly it will go off and symptoms come one after the other.
It doesn't seem to effect the running of the engine, indicators still work (probably dim but not been able to confirm) and A/C still operates.
There is an after-market alarm fitted, but don't see how that could effect electrics like this.
Any ideas on where to start looking? What could cause these symptoms?
Regards,
PaulS
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