INSTALLATION
This radio will fit all Chevrolet and GMC truck models from 1967 thru 1972. It will also fit Chevy Van and Handi Van. It is only
technically correct for Chevy Trucks from 1970-72 (FM radios were not offered as an option for the trucks until late 1970). GMC and
Chevy Vans had slightly different dials and the mounting was different for the original radios. 1967 and 1968 knobs were also slightly
different. The front of your new radio is a dimensionally exact copy of the original, so it will install the same way that the original
radio did. The radio is much smaller when viewed from the back than the original was, so the original mounting bracket won't fit.
Included with your radio is a 9 inch Backstrap that can be easily cut and bent to any shape or size. It is intended to bolt to the ¼ -20
lug on the back of the radio near the antenna jack and to the location where the original bracket was attached.
The radio is held in the dash by using the 2 (supplied) control shaft “baskets”. These are identical to the original parts. The widest
opening in the basket should be at the top of the shaft so that the narrow slot fits over the guide in the face casting. A 9/16” spark plug
socket will make it easy to snug up the shaft nuts. Do not overtighten them!
DIAGNOSTICS
No Sound:
Check for a good fuse with proper rating. When the radio is turned on, the orange wire should have 12 volts
present. Every speaker lead should measure about 6 volts to ground with the radio on and volume low. During start up
diagnostics if the radio detects a shorted speaker wire the radio will shut off that speaker lead until the issue is resolved.
Radio will mute when no station is received. Make sure antenna is plugged into the proper jack. If an accessory is not
connected there will be no audio in auxiliary mode.
Weak or No Reception:
Check continuity between the center pin of the antenna plug and the antenna mast. It should read
0 ohms (like a short). Next, check continuity between the center pin of the antenna plug and the car body. It should not
read (like an open circuit). If you’re in a metal building, reception may be limited. Try it outside.
Ignition Noise:
Usually caused by an ungrounded antenna shield. The base of the antenna must make good contact with
the car body. This problem often shows up after a good paint job! Make sure the engine grounding straps are in place,
clean and tightly bonded to the frame.
Distortion:
Check to see if your speakers can handle at least 45 watts RMS. Small speakers that can only reproduce high
frequency will distort on bass notes. Make sure speakers are properly installed. Make sure that no speaker is grounded.
Every speaker lead should measure about 6 volts to ground with the radio on and volume low. Resistance in the DC power
input wiring can cause the amplifiers to “starve”. If distortion seems to increase with volume, measure the voltage on the
orange wire. If the voltage drops when the volume is raised, it is an indication of resistance between the battery and the
radio – usually at the fuse block, but sometimes in the ignition switch. If the backstrap is not bolted to a clean metal
ground, try running a heavy ground wire from the ground lug on the radio directly to the firewall.
Radio shuts off after a few minutes:
The radio has thermal protection built in to prevent damage from excessive heat.
Possible causes are shorted or grounded speaker wires. See if any unused wires can touch anything. Make sure the heater
or defroster duct isn’t blowing directly on the radio.
Dial pointer issues:
If the dial pointer gets stuck at one end or if it is misaligned, hold down one of the preset buttons for
5-10 seconds to realign or free dial pointer. If the dial pointer is stuck at one end of the dial, turn the tuning knob. The dial
pointer should try to move while you're turning the knob. Continue to turn the tuning knob until the pointer resets itself.
BE SAFE:
Make sure you are familiar with the way this radio works before you go out on the road. Driving demands
your full attention. Texting while driving is dangerous and it is illegal in many states. Remember: not all drivers have
hands free phones, so the guy next to you may be driving while distracted.
The
Bluetooth®
word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by Antique Automobile Radio, Inc. is under
license. Other trademarks and trade names are those of their respective owners.
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