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1948 - 1956 F1, F100 & Larger F-Series Trucks Discuss the Fat Fendered and Classic Ford Trucks

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Old 07-06-2014, 02:30 PM
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Stock 55 light switch and EZ wiring harness

Wiring my truck with a 21 circuit EZ wiring harness. My question is has anyone done this using the stock light switch and this harness. I have the stock diagram, but it doesn't seem that things hook up the same. I have the front and rear left park lights connected where they should be and they also feed the right parks, front and rear. I have a dimmer wire, headlight power and instrument lighting. It seems that something should go on the main power lug that is fused.

Any help or revised diagram would be greatly appreciated.
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Old 07-07-2014, 11:40 AM
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Is the EZ kit setup to run a GM switch?
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Old 07-07-2014, 12:24 PM
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Yes the EZ harness has a plug to plug directly into a GM switch. Your 55 switch is for 6 V pos ground. You will need to swap it for a 56 12V neg ground switch or better yet buy the GM direct plug switch from EZ wire. There may be a way to wire your switch, but I wouldn't trust a 60 year old switch that most of the truck's original wiring was run thru.
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Old 07-07-2014, 01:31 PM
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I am interested in this also so my ? Can you use a relay with the old switch to lower the currant going through the switch with May be a block or something for the rest of the elect circuits?
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Old 07-07-2014, 04:15 PM
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Did you call the EZ folks and ask? Might pay big dividends. Just a thought.
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Old 07-07-2014, 05:36 PM
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I found the EZ folks to be very helpful.
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Old 07-07-2014, 06:01 PM
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Thanks for the input. This is a 12V light switch not the old 6V. I did contact EZ and they advised to put headlight power to the B post. So I did.

I started testing. When I connected the positive cable to the battery, I realized that I had my hazard flashers on, 3 of 4 worked. So with indication. I thought I was good to go. I went to the run position and the electric fan came on as I have it wired, I got the diagnostic sweep of the tach and speedometer and gauges seemed to be working. So with that I decided to switch to start position. Within a second or so, the battery exploded. I have double checked all the connections on the switch and they are correct.

Do any of you know what could cause this. I also have an email into EZ.

Thanks
Pat
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Old 07-07-2014, 07:25 PM
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Hope you weren't anywhere around the Battery. I had one blow up almost in my face. Bloodied my nose and ate my cloths including a heavy coat almost down to my underwear. Had some issues with my eyes as well.
The explosion indicates you had a Very Good short!
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Old 07-07-2014, 08:47 PM
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It does not mean it won't happen but I have had two batteries explode while I working as a mechanic and all the others I have heard of exploding had an internal issue in the battery. That caused the spark inside the battery case that caused the hydrogen gas to ignite, think Hindenburg.
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Old 07-08-2014, 10:57 PM
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I believe I found my problem. While testing/buzzing wiring. I found that both large posts and the I-post on the solenoid buzz for continuity on the installed solenoid. On a new one which I hope is good. Neither large posts buzz, but the I-post does. I don't think the installed one is fuzzed together. I also need to install the fusible link wire to the red battery wire.
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Old 07-08-2014, 10:57 PM
 
 
 
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