Re: 1970 AM radio voltage?
[Re: 69/70 Plymies]
#2018470
02/24/16 12:03 AM
02/24/16 12:03 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Can you tell me if the 10.9 v looks ok at the red wire? No, system charging voltage should be in the 13's & even key on should be higher than that (10.9).
live every 24 hour block of time like it's your last day on earth
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Re: 1970 AM radio voltage?
[Re: 69/70 Plymies]
#2019347
02/25/16 10:46 AM
02/25/16 10:46 AM
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Joined: Jun 2012
Posts: 1,386 Philadelphia PA
Pynzo
Drugs are bad
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Drugs are bad
Joined: Jun 2012
Posts: 1,386
Philadelphia PA
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Well, the battle goes on. One thing I discovered was that the voltage coming into the fuse box (red w/ white tracer) at bottom of fuse was 12.3v, but at the top of fuse was only 11.4v. I cleaned the fuse holder and installed a different 20A fuse. This got me 12.3v top and bottom. Unfortunately, with key on, the radio hot wire still was all messed up. It would read from 2.5 to 11.2v from turning the key on different times. Even at 11.2, the radio would not work. I ran a jumper hot wire from battery to radio and shazam, the radio worked great. That speaker (from a '69 RR) has not made sound since 1975. But I still have my radio wire voltage problem. I wonder if the ignition key switch socket is the problem? The switch was new 2-3 yrs. ago. What do you fellows think, now? It's hard to think real well when you're working on this for hours in 29 degree temp. Thanks for any additional ideas! 4 Speed or Automatic? The Back Up Lights power (white wire) pigtails off of the Radio power wire at the Radio Connector. I had a beauty of a short in the Radio Power wire at the top of the Ash Reciever from rubbing. Look for a short and put it in neutral if it's a 4Speed. My aftermarket Ignition switch is hit or miss in Accessories position, that could be a problem also.
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Re: 1970 AM radio voltage?
[Re: 69/70 Plymies]
#2019454
02/25/16 02:18 PM
02/25/16 02:18 PM
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Joined: Jun 2012
Posts: 1,386 Philadelphia PA
Pynzo
Drugs are bad
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Drugs are bad
Joined: Jun 2012
Posts: 1,386
Philadelphia PA
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You've got to mean the lock cylinder. You have to disassemble the column to replace the switch. I've got JS Restoration reworking my OEM ignition switch. Could be the lock cylinder you installed does not move the ignition switch to the correct position either in Accessories or IGN1 positions. And definitely check the radio power wire for shorting out at the ash Reciever! How well do your backup lamps work? Same circuit as the radio- https://board.moparts.org/ubbthreads/ubbt...tml#Post1672042Take a minute and read through my above post. All my trials and tribulations on '70 B Body wiring were addressed. Especially the Radio stuff!
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