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EFV-8 Club Forum / 1940 Ford Discussion / Battery Gauge:

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TomO

06-25-2019 @ 6:41 AM

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The readings you posted for the ground check, indicate a grounding problem with the regulator or generator. Clean some paint from the back of the generator mount and the mounting surface of the generator on the intake. Make sure that the grounding cables from battery to the firewall and from the firewall to the intake are in good condition and tight. I like to place a star washer under the firewall and intake connections.

It does sound like your ignition switch is worn. I would replace the Bakelite switch body and the brush.

You need to raise the RPMs to about 1,500. Pull your throttle out about 1/3 of its travel to check the charging system out put.

Tom

trjford8

06-25-2019 @ 7:00 AM

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If you have the old woven style ground straps they have a tendency to corrode causing poor grounding. If they are old or look old change them.

fortyford

06-25-2019 @ 4:01 PM

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Well I pulled the battery cables off today and I am actually embarassed!I know y'all like photos so here is two of the cables.I cut the insulation back so the ugly can be seen.I been driving this 40 for several years,put about 10,000 miles on it?I did not realize the cables were that bad!The ground from firewall to engine is mounted to head bolt.Is this the right place?Tom,I did remove the regulator and cleaned the paint off .Took the switch block off and cleaned it.Ordered new cables from Carpenters.

This message was edited by fortyford on 6-25-19 @ 4:10 PM

fortyford

06-27-2019 @ 6:54 PM

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Wanted to give an update on the battery gauge problem.After changing all those nasty cables the problem is solved.At 55-60mph the needle registers in the green area now!I am going to sent a used coil that loses fire when trying to crank hot to Skip for rebuild.I found this diagram on the battery gauge-not sure if it is accurate or not?

TomO

06-28-2019 @ 6:56 AM

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Yes that diagram shows the voltages range for each of the colors on the gauge. These meters are accurate enough to determine if everything is working OK.

Good work in diagnosing the problem without spending useless $$$$ on unneeded parts replacement.

Most 1940's have the grounding cable from the firewall to the engine connected to an intake bolt. This give a better ground to the generator.

Tom

fortyford

06-28-2019 @ 11:54 AM

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Thanks Tom for all your help on this problem. Russ

fortyford

06-29-2019 @ 6:20 PM

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Tom I sent you a PM.

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