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78 Concord ECM

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Concord4spd View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Concord4spd Quote  Post ReplyReply Direct Link To This Post Topic: 78 Concord ECM
    Posted: Mar/22/2020 at 3:23pm
Every once in awhile car won’t start and clicking sound like dead battery.  If I disconnect the pos. Battery terminal hook it back up it starts. I am thinking the ECM.  What you all think?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote purple72Gremlin Quote  Post ReplyReply Direct Link To This Post Posted: Mar/22/2020 at 3:25pm
No ECM. Bad connection at the battery is my first thought. Or corroded cables

Edited by purple72Gremlin - Mar/22/2020 at 3:30pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Heavy 488 Quote  Post ReplyReply Direct Link To This Post Posted: Mar/22/2020 at 3:57pm
Do the battery cables have oriiginal clean factory terminals or those patch terminals people like to use with the 2 bolt clamp on ends?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Concord4spd Quote  Post ReplyReply Direct Link To This Post Posted: Mar/22/2020 at 4:43pm
The pos. Has one of those disconnect knobs. I think when the car was restored the factory cables were used. I won’t get back to the car till Tuesday. I will get rid of the safety disconnect and reset the connections. There is no rust or that junk that collects on the terminals.  Thanks guys!

Edited by Concord4spd - Mar/22/2020 at 4:47pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote purple72Gremlin Quote  Post ReplyReply Direct Link To This Post Posted: Mar/22/2020 at 4:59pm
Originally posted by Concord4spd Concord4spd wrote:

The pos. Has one of those disconnect knobs. I think when the car was restored the factory cables were used. I won’t get back to the car till Tuesday. I will get rid of the safety disconnect and reset the connections. There is no rust or that junk that collects on the terminals.  Thanks guys!
looking clean doesnt mean much. Clean the terminals. 
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Concord4spd View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Concord4spd Quote  Post ReplyReply Direct Link To This Post Posted: Mar/22/2020 at 5:46pm
So Tuesday will be battery post cleaning day.  Thanks for your help. Your knowledge is much appreciated. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tomj Quote  Post ReplyReply Direct Link To This Post Posted: Mar/22/2020 at 8:35pm
The connections need to be so tight you cannot wiggle them. ANd the metal inside shiny. Shiny contacts shiny. ANd if you wiggle a cable, ifs trands are visible in the crimp, they should not move. ANd you should feel confident that you can yank on the cable fairly hard and have it not come out or loosen.

This applies to the big fat ground cable from block to chassis too.

I used to have one of those disconnects, but that happened to me all the time, I removed it. The one I had wasn't very well made. Seemed like decent brass, but even with the green knob as tight as I could get it, wiggling the cable still allowed motion.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote FSJunkie Quote  Post ReplyReply Direct Link To This Post Posted: Mar/23/2020 at 2:21am
Battery disconnects and the two bolt repair terminals are asking for trouble. No connection is more reliable and conducts better than a regular crimped or soldered on terminal, preferably sealed airtight so acid cannot wick into it.

Starter relays can get flakey too.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote maximus7001 Quote  Post ReplyReply Direct Link To This Post Posted: Mar/23/2020 at 3:29am
I had an electrical fire with my 81 Concord due to the original battery cables being rotten internally. That was back in 2004. Had to tow the car home. Luckily I had some bolt cutters in the trunk and was able to cut a cable quickly. Easy enough to just change all 3.
A friend of mine back in 1999 got a free 77 caddy because it had intermittent starting issues that garages never solved. We had to change the main cable, it was like 5 feet long. Looked ok but was rotten inside. Had it figured out 30 min after the tow truck dropped it off. Not really totally free, cost the tow and the cable.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Concord4spd Quote  Post ReplyReply Direct Link To This Post Posted: Mar/24/2020 at 3:45pm
Worked, thanks!
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