Failure 03

[ChaotY2k]

Hello together,

I built a GM 1200 into a BMW. The equipment is directly to the battery attached (naturally fused) and switched by a separete switch. The equipment is built into the right floor space and connected to the display built into the center console with a flat cable. As soon as the equipment is switched on and afterwards the engine one starts, briefly "error 03" comes and then the equipment starts again.
In addition one hears the driving noises when sending on the channel in the background (sounds like a disturbance of the ignition) Someone an idea? Perhaps connect a condenser (if: as large?)

Thanx a lot

Juergen

[RadioSouth]

If I'm reading you right you're cranking the car with the radio already on ,
and this is when ERR03 comes up ?

[tvsjr]

The fail 03 is probably being tripped by the low voltage present when you crank. Turn the radio off before cranking.

As far as the noise on TX, you need to check your grounding (make sure you have good low-resistance ground, and check the path the "flat cable" makes from the radio to the display. Your errant noise is likely being injected in one of these two places.

Motorola doesn't use flat cable on their radios for a reason - no good way to provide shielding.

As far as your ground, are you taking that straight to the battery or to a hardpoint on the body or frame?

[ChaotY2k]

Hi

we don't have this error on any other car... - even the motor is starting...

The Device is connected to the body of the car

Greets

Juergen

[wa2zdy]

It sounds perhaps like alternator whine - the "driving noise" and that could be caused by diodes in the alternator failing or very often the ground cable connection to the battery being dirty or otherwise defective. And THAT would also explain the voltage related problem while cranking - the problem that doesn't happen with other vehicles.

Not for sure, but the two symptoms together warrant checking that ground cable integrity.

[Blitzbug2u]

Have an alternator shop check your alternator for a bad "diode pack". If one or more of the diodes go bad, two things will occur. One, the voltage drop out will be more audible on radio (two way or am/fm), and mostly, the charge rate of the alternator will be reduced. You won't initially notice the reduction, but the output won't quite 'keep up' with system requirements and the battery voltage will slowly drop. After a while, you will notice such resultsd as your am/fm will lose it's programming "for no reason". I suspect there is a similar issue with the two way radio. The battery may have to be replaced due to age or long-term "anenic" charge, as above, goog luck. Blitz.