Author Topic: Died and will not start  (Read 159 times)

Offline brotow

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Died and will not start
« on: August 29, 2020 - 12:58:54 PM »
My 1970 Challenger with I believe 1971 rallye gauges dash has been running fine, but lately engine had trouble with higher rpms. Now it wouldn't restart after getting gas, It will start and run until I release the key from the start position to the run position and dies.  I replaced the ignition switch, didn't solve the problem. I remember before replacing the ignition switch the coil showed low voltage to it.  I'm running a stock electronic distributor. Does 1971 dash have a seat belt interlock system? I'm at a loss, any suggestions?
70 Chall. vert.(in process) - 73 Amx -74 Javelin- 87 Wrangler-02 Sebring conv. 2005 Crossfire srt roadster




Offline dodgedream

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Re: Died and will not start
« Reply #1 on: August 30, 2020 - 08:59:54 PM »
Sounds like your ballast resistor has given up.fast fix and I would recommend carrying a spare as they are known to fail

Offline JayBee

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Re: Died and will not start
« Reply #2 on: August 31, 2020 - 09:37:52 AM »
I second the vote for ballast resistor.
John

1970 Barracuda convertible
2000 Toyota Avalon

Offline brotow

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Re: Died and will not start
« Reply #3 on: October 09, 2020 - 05:28:42 PM »
Switched out the ballast with a new one, (resistance measured the same). Bought a new ignition control box, no change (MOPAR HR7500 Electronic Ignition Module).  https://www.ebay.com/itm/324317385004   
« Last Edit: October 09, 2020 - 05:34:36 PM by brotow »
70 Chall. vert.(in process) - 73 Amx -74 Javelin- 87 Wrangler-02 Sebring conv. 2005 Crossfire srt roadster

Offline 'Cuda Hunter

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Re: Died and will not start
« Reply #4 on: October 09, 2020 - 09:38:00 PM »
seatbelt interlock system started in 74. 
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Offline jimynick

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Re: Died and will not start
« Reply #5 on: October 09, 2020 - 10:28:30 PM »
I'm not a big electronics guy, but I seem to remember that the coil is supplied a full 12 volts in start position and that it then goes down to about 8 volts if I remember. I'd be looking at a schematic to determine the colour of the run wire- for some reason I want to say it's brown- and check for connectivity at the firewall bulkhead connector- a notorious source of wiring failures and problems. Just my  :2cents:

Offline brotow

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Re: Died and will not start
« Reply #6 on: October 10, 2020 - 04:20:27 PM »
Yep. that would be my next step.
70 Chall. vert.(in process) - 73 Amx -74 Javelin- 87 Wrangler-02 Sebring conv. 2005 Crossfire srt roadster

Offline brotow

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Re: Died and will not start
« Reply #7 on: October 11, 2020 - 08:28:47 PM »
My thanks to  jimynick.  Loose? connection in the bulk head connector. never found the reason, it's up and running' moving the wire around did not make it stall out.
70 Chall. vert.(in process) - 73 Amx -74 Javelin- 87 Wrangler-02 Sebring conv. 2005 Crossfire srt roadster

Offline jimynick

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Re: Died and will not start
« Reply #8 on: October 11, 2020 - 11:03:17 PM »
Good to hear you got it!  :thumbsup:

Offline 70chall440

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Re: Died and will not start
« Reply #9 on: October 20, 2020 - 01:00:45 AM »
Check the steering column connector as well, I had a very similar issue. I realize you got it sorted out but check the connector just be sure.
Current Mopar
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
Past Mopars
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)