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EFV-8 Club Forum / General Ford Discussion / Starting system

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Discussion Topic: Starting system -- page: 1 2

silverchief

08-19-2019 @ 1:53 PM

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First question. New lead acid battery in my stock 46. Previous battery replaced by vendor even though it tested good. New battery will discharge overnight or start the car at residence, then not able to turn the engine after an hour at destination. Connected two separate test lights to positive post and to removed positive (grounding) cable - no sign of drain. Owners manual says use a volt meter in the same connection, and any voltage shown means there is a drain My voltmeter shows about 4 volts. I've done this twice with the same result.
What is recommended sequence in checking for short.

Second question. Owners manual says to test for open circuit in starting motor - press starting button and horn at same time. If horn blows there is an open circuit in the starting motor. Before pulling the starter, I would like to eliminate the solenoid as a possible culprit. It clicks when I hit the starter button or activate the push button on the bottom with the battery discharged, and appears to work properly
otherwise. Is their a test I can do?

Thanks for the help.

This message was edited by silverchief on 8-19-19 @ 2:10 PM

40 Coupe

08-20-2019 @ 6:19 PM

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You do not have a short circuit, if you did have a short you could not get the car to start even with the battery charged. DO you have a clock? Get the wiring diagram for your car. Does your car have the original wiring or has it been modified? Charge the battery disconnected overnight. Put a voltmeter on the charged battery what is the voltage? Let the battery stand disconnected and read the battery voltage again the next day the voltage should be nearly identical to the charged battery voltage.

For your second question, what is the problem with the starter? I believe you said the car does start with a charged battery. If so the starter appears to be good.

Have you put your analog voltmeter on the battery with the engine running? Does the voltage increase when you increase the engine RPM?

37RAGTOPMAN

08-21-2019 @ 2:10 PM

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hi silver chief
charge the battery, check the voltage, then disconnect the battery.
next day test the voltage.
connect the pos battery terminal and see if the car starts.,
if it does,
disconnect the pos battery terminal, put a test light bulb, between contacts from the terminal to ground, inline
if it lights,
start disconnecting various items to see what is the drain, and see what goes off,
also disconnect the generator wiring, it might be a drain also.
does it get warm over night ?
get back with the results you find,
hope this helps 37Ragtopman
like the clock, also I have seen the brake light switch go bad so the brake lights stay on, dash light
also check the dimmer switch, for corroded terminals.
HOW OLD IS THE WIRING ? very important might be frayed and making contact, very dangerous, could cause a FIRE

silverchief

08-24-2019 @ 8:59 AM

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Hi guys

Took the starter to a reputable starter rebuilder. He Found no faults except something (don't recall) was "really dragging at the back plate."so I replaced the back plate. Asked if I had installed this start. I told him no, it came with the car and that excepting the past 6 months or so the starter had always performed nicely for the past 15 years. He showed me number 12 stamped into the top of the housing and advised the starter is or was at some time been a 12 volt.

Installed the starter with no improvement. Same problem. Plus, owners manual says if horn blows with starter engaged there is a short in the starter or the relay, so replacing the solenoid today.

Also, battery does not go completely dead overnight,
it only drops down to a little over 4 volts - but will not kick the engine over at that charge. Barely a solenoid click.
Put it on the charger for about 30 minutes and "boom" everything works perfectly - until you try to start it again a few hours later.

Replacing the solenoid today as it is the only thing left. It is of nice quality with a push button bottom and I will try an older one I have with my parts. If no change I'm putting the new one back on.

I'm going to print out and work through all your suggestions and will let you know what happens.

Thanks for your help.

silverchief

08-24-2019 @ 9:02 AM

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Forgot to mention complete new wiring harness installed last year.

08-24-2019 @ 9:39 AM

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"new wiring harness installed last year" - Recheck all the connections made to be sure this harness was installed correctly....

silverchief

08-25-2019 @ 12:30 PM

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Battery is fully charged with both cables connected. Everything is dead. Lights, horn, radio.

Test light from negative battery post to batt side of solenoid shows nothing. Touching to ignition side post of solenoid shows nothing. Jumping the solenoid posts with pliers produces no spark whatsoever. No light when touching small terminal.

Test at ignition switch shows no power getting there.

With small terminal grounded, pushing bottom button on solenoid lights test light.

The test light also lights when I touch the solenoid case itself.

What is happening?

This message was edited by silverchief on 8-25-19 @ 1:02 PM

08-25-2019 @ 1:22 PM

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Show us some pictures of all the wiring under the hood....

silverchief

08-25-2019 @ 2:24 PM

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From the time of it's installation a little over one year ago, there has never been any kind of the problem that points to the harness not being correctly wired. It is a Rhode Island harness patiently installed following their blueprint.
If that were the case it would have raised it's ugly head a long time before now.

08-25-2019 @ 3:08 PM

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Still, pictures would be very helpful....

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