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'79 Goes 'dark' when trying to start #725043
June 24th 2017 10:29 am
June 24th 2017 10:29 am
Joined: Nov 2016
Posts: 21
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Eyeteeth Offline OP
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Eyeteeth  Offline OP
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Greetings, I've developed dreaded electrical problems. Looking for some advice, suggestions,... maybe a shoulder to cry on.

So, open the door, lights come on. Put key in the ignition, and try to start it, it may or may not make a few clicks, but it always shuts down electrically. Dome light goes off, blower fans stop, nothing. Usually, after a varying length of time. Lights, fans, etc will work again.

Other possible noteworthy items.
Tried two batteries, one brand new. Multimeter shows 13v at the battery. (I can't tell you if that dips when turning the key as there is only one of me currently)
I did have the same effect when I tried turning on the headlights before starting it.
All fuses by the glove compartment are good.
Haven't been able to try jump starting it yet due to location and lack of a battery jumper pack.
Seems to go beyond an ignition module or ballast resistor. Acts like it shorting, but the fuses are good, there is no 'smell' and power eventually comes back on... which seems weird.

Currently, I'm stumped.. and I hate dealing with electrical... so that makes it even worse.

Thanks...

Re: '79 Goes 'dark' when trying to start [Re: Eyeteeth] #725044
June 24th 2017 12:15 pm
June 24th 2017 12:15 pm
Joined: Jun 2003
Posts: 12,892
Burlington, On, Canada Eh !!!!
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Burlington, On, Canada Eh !!!!
With vehicle running it should be14.4 at the battery. Check all your grounds for corrosion.Try running a booster cable from the negative side of the battery to the block with a charged battery. If your ground strap is a crimped one tug to see it is not broken in the crimp itself,


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Re: '79 Goes 'dark' when trying to start [Re: Eyeteeth] #725046
June 24th 2017 2:29 pm
June 24th 2017 2:29 pm
Joined: Aug 2001
Posts: 11,620
Fircrest, WA
Reed Offline
Maniac
Reed  Offline
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Posts: 11,620
Fircrest, WA
Make sure the battery cable terminals are clean (both battery and cable) and tight.


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Re: '79 Goes 'dark' when trying to start [Re: Eyeteeth] #725048
June 24th 2017 3:28 pm
June 24th 2017 3:28 pm
Joined: Aug 2002
Posts: 13,595
Lake City Florida, United Stat...
lukester Offline
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lukester  Offline
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Sounds like a bad ground. As stated above I would start at the battery terminals and go from there.


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Re: '79 Goes 'dark' when trying to start [Re: Eyeteeth] #725064
June 25th 2017 8:08 am
June 25th 2017 8:08 am
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Eyeteeth Offline OP
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Eyeteeth  Offline OP
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Thanks for the responses. I hate dealing with electrical... it quickly reduces me to quivering blob in the corner. But it was a simple as fixing the ground. Seems every year around this time I would have to replace the ignition module, but this was acting different. having it stay powerless for an undisclosed amount of time was throwing me from thinking it was the ground... But... it was.

Again, thanks.

Re: '79 Goes 'dark' when trying to start [Re: Eyeteeth] #725079
June 25th 2017 9:12 pm
June 25th 2017 9:12 pm
Joined: Aug 2002
Posts: 13,595
Lake City Florida, United Stat...
lukester Offline
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lukester  Offline
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Posts: 13,595
Lake City Florida, United Stat...
Glad to hear you got it. cheers


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Serenity:1985 Chevy G-20
The Outcast:1983 Ford club wagon
Freedom:1990 Ford E-150
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Re: '79 Goes 'dark' when trying to start [Re: Eyeteeth] #725147
June 29th 2017 1:44 am
June 29th 2017 1:44 am
Joined: Mar 2007
Posts: 4,343
Dundee, Michigan
Ram4ever Offline

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Dundee, Michigan
Glad you found it without more ECU replacements! Was the ground issue at the engine block or at the battery terminal? Did you think to take any pictures of what you found? It would be really interesting to see what if any visible evidence there was.


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Re: '79 Goes 'dark' when trying to start [Re: Eyeteeth] #726459
August 03rd 2017 10:28 pm
August 03rd 2017 10:28 pm
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Eyeteeth Offline OP
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Eyeteeth  Offline OP
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It was at the Battery terminal, and, there really was no visual evidence. I didn't take a picture. Didn't cross my mind.


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