63_ Ignition switch doesn't kill engine_ Cont'd
.... based on comments from a previous (aged 1 yr) post, we used my trusty volt meter on my friend's 63 and found that the coil was still hot with the ignition key off; indicating 1) a short in the solenoid or 2) a short in the wiring harness. He is going to connect a "known to be working" solenoid to see if that solves the problem. If that does NOT solve the problem, what is the next step. What is the procedure for specifically confirming that there is a short in the harness? And if a harness short is indicated, is there a remedy that doesn't require harness replacement?
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Re: 63_ Ignition switch doesn't kill engine_ Cont'd
First, disconnect the harness at the firewall, then check for power at the coil. If present, the problem is in the solenoid.Bill Clupper #618 -
Re: 63_ Ignition switch doesn't kill engine_ Cont'd
Steve, during the starting process the solenoid feeds the full 12 volts on start to ing. coil and starter solenoid, and to recieve 12 volts constant to ing. coil system the solenoid internal paddle would have to be stuck on also engaging starter.Bill sound sound correct to you?
What I have seen before is the engine harnesses get hot and melt wires together over an the pass. side fender area. Sometimes the taped harness will hide the problem.New England chapter member, 63 Convert. 327/340- Chapter/Regional/national Top Flight, 72 coupe- chapter and regional Top Flight.Comment
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Re: 63_ Ignition switch doesn't kill engine_ Cont'd
Steve,
If it is the original 63 switch you may have a problem with carbon tracking in the switch itself. I've had this problem before and it resulted in the switch burning up. The carbon catches fire and the bakelite in the switch will burn at those temps.
Check it out for safety's sake!
JRComment
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Re: 63_ Ignition switch doesn't kill engine_ Cont'd
This is assuming you have checked that you have NO voltage on the Pink IGN terminal of the ignition switch in the OFF position (edit) with Pink wires removed.....If so it is either a bad switch or it's miswired.
I suggest before you go through the trouble of replacing the solenoid, this is what I would do.......
-diconnect battery power.
-remove the Pink wire from the "R" post on the solenoid.
-reconnect battery. key off.
-test voltage at "R" post....if 12v, bad solenoid.
if no voltage.....
-test voltage on the Pink wire from "R" post. Based on that it will tell you if you have a short somewhere. The Pink wire goes through the grommet near the Wiper Motor to IGN switch, not through the firewall connectors. From IGN switch Pink also goes to the fuse box and comes out as a Light Green wire to power gauges, fuel sender, etc. This is where it also goes through the firewall connector(rear lights, sender, etc). See below diagram. As suggested, disconnect firewall connector and see if 12v disappears on the IGN circuit. If it does, the short is in the connector or rear harness. Be careful near the fuel sender! I have found low grade shorts in the wiring on the back side of the fuse box before. If you venture there be careful as wiring will be delicate if original.
Please let us know your results.
RichComment
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Re: 63_ Ignition switch doesn't kill engine_ Cont'd
I'd suspect the ignition switch, as it feeds the coil (+) directly from the "IGN" terminal on the back of the switch, right through the firewall grommet. If the "IGN" terminal (or the bottom terminal on the ballast resistor) shows power with the key in the OFF position, the switch has failed.Comment
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Re: 63_ Ignition switch doesn't kill engine_ Cont'd
Guys_thanks for all of the input. We will do the checks as suggested. Rich_ Let me see if I have this right. If we unplug the harness at the firewall and the coil is no longer energized, the firewall connector or the rear harness is indicated. If the coil is still hot after unplugging the harness at the firewall, is the front harness indicated (as Ed suggested)?
SteveComment
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Re: 63_ Ignition switch doesn't kill engine_ Cont'd
Actually if the harness is unplugged at the Firewall/dash and the problem goes away, you have narrowed it down the the IP wiring or the Ign switch for the most part, unless you can see a problem in the connector itself (Bent/damaged terminal)Bill Clupper #618Comment
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Re: 63_ Ignition switch doesn't kill engine_ Cont'd
Steve, do a visual inspection of the harness and wires. looking for melted tape,wires branching off going to starter area by heater box.if your dealing with waht you believe to be the original harness unplugging and replugging sometimes disturbs connections and may create something else. just look at the harness closely first before the unplugging process. EdNew England chapter member, 63 Convert. 327/340- Chapter/Regional/national Top Flight, 72 coupe- chapter and regional Top Flight.Comment
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Re: 63_ Ignition switch doesn't kill engine_ Cont'd
I was wrong about the Lt Green going through the firewall bulkhead conn. I checked the AIM and it goes through the "body" connector located under the dash. AIM Sec12 Sheet C2. This is where the entire rear harness wiring gets connected. Only the Violet goes through the firewall connector for the starter solenoid(with other wiring).
If you pull the fuse for the Lt Green (I forget what it's marked, maybe "Gauges" or "Inst"), that should help diagnose a short in the rear harness. Using the diagram below that I just made, you should be able to narrow this down.
You really need a voltmeter or test light to diagnose. I saw on your earlier threads(below), you have already changed the Ign switch and Regulator.
Rich
edit.......I updated the diagram. Lt Green also goes to the Park Brake switch to power the dash light. Also noted the fuse "name".....It's "Brk Alarm Gas Ga" according to the AIM and it's the top fuse in the fuse block.
63ign.jpgComment
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Re: 63_ Ignition switch doesn't kill engine_ Cont'd
Rich
Thanks for the diagram. I also retrieved an old engine harness from the attic and have identified the part of the harness where the pink wire could possibly come in contact with a battery source (red) wire. We will probably try again next week-end. I'll keep you posted.
SteveComment
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Re: 63_ Ignition switch doesn't kill engine_ Cont'd
Steve,
Ok, good luck. Note I updated the diagram and added some notes in the previous post.
RichComment
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