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Hi,
The problem you're having with your radio
is most likely AC"noise" riding on the 12 volt DC line. When I replaced the
radio in my ' 70 O'Lander, when I turned it on, the in-line filter Capacitor
exploded. When I checked the 12 VDC line with my Digital Voltmeter set on
AC volts, I read 18 volts of AC. This was more than enough to fry the capacitor.
When I checked each output from my converter (not a Univolt but a replacement) I
found four were filtered,(less than 0.1VAC noise) and 4 wer un-filtered (18 VAC)
whoever replaced the converter just hooked the wires up with no idea where they
were going. The circuit that was hooked up to the unfiltered DC fed the TV
antenna amplifier, (smoked that too!) the 12 Volt convenience plug below
the antenna assembly AND the radio power wiring.
I rang out the wiring and identified the
circuits and connected the filtered DC to the proper circuits. It's an easy
check with a DVM, just connect your test leads across the 12 v line with the
meter set to AC Volts. if the noise is greater than 1 volt, you may need some
suppression. Just remember, you can't filter a very great amount of AC noise
with just caps.
S. W. Sandy
WBCCI # 4159 & VAC Region 2 VAC Representative 1970 27' Overlander South West New Jersey Mail to: swsandy@mindspring.com |