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Rread006

314-8 test switch not matching any schematics help!!

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Rread006

ok I recently got a 314-8 the test switch wiring was destroyed. There is a three wire test switch and the grey wire going to the indicator module is there, but by all schematics I see for it it shows a 12 volt + supply to it and a grey going to the module so why does it have a three wire switch and a three wire connector? I don't want to destroy the indicator module if it's looking for a ground rather than a +. Any thoughts?

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Save Old Iron

The gray wire requires 12 volts during the test function. Some indicator pcbs require a "third wire" to enable the test function on the oil level indicator as it is a completely separate circuit from the other indicators.

Edited by Save Old Iron

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Rread006

Ok well I guess it's that third wire I'm trying to figure out I'm not even sure if. I'm looking at the right screematic I'm really good with 12v circuits but I'm at a loss because it looks like a rat ate this section I was going to just going to tag a fused 12v+ off the battery to a basic momentary contact switch because the old three terminal switch is broken. But I'd love to have the oil lite working also if possible. If anyone knows where this third lead is suppose to go shine a light this way or if it's a n.o n.c situation I have no idea

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Save Old Iron

I'll post schematics in the morning. The test switch applies 12 volts to one part of the board (pin 10) and I believe connects two other pins of the pcb connector together at ground (pin 6 and 9).

Edited by Save Old Iron

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Save Old Iron

see if this makes sense with your particular setup

 

these are not official WH schematics - I created these from repairs I performed on several indicator boards. I believe they are correct.

 

419a%20oil%20low%20schematic_zpsuj7r7nud

Edited by Save Old Iron

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Save Old Iron

and this

 

418A%20indicator%20pcb%20LS86%20workshee

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Save Old Iron

also. let me know if the test light switch has 6 contacts on the back of the switch body.

 

check each of the lugs on back of the switch - there should be some evidence of where the previous wires were soldered on. we can work from there.


if you have the newest generation of indicator pcb with LED's

 

the schematic looks like this (haven't had time to pretty this one up yet)

 

3rdgen2x2_zpsd2676923.png

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Rread006

Thank you sir! The test switch only has three terminals so is it providing ground thru the case and then a 12+ loop thru the other two terminals? If so I can use a mini relay and a basic momentary switch to loop the 12+ and as a trigger to the mini relay to provide ground

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Save Old Iron

we may have to rewire a few connections

 

sorry - double post

Edited by Save Old Iron

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Save Old Iron

we may have to rewire a few connections

 

but we should not have re-engineer the wire harness.

 

are you able to post a picture of

 

1/ the top of 12 pin circuit board connector (to CLEARLY show wire color and placement in the connector)

 

2/ either the front or back of the indicator board (to aid in identification of the pcb version)

 

3 / if your electrical wiring to the indicator pcb has a white 9 pin connector feeding into the 12 pin pcb connector, take clear pics of the wire colors and their positions entering and leaving the 9 pin connector.

 

 

the diagram attached below is from a 416 but I would bet it may also represent your 314.

 

note the gray wire on the test switch will connect to a red wire on the ignition switch

 

 

post-1689-0-70888000-1429988054_thumb.pn

Edited by Save Old Iron

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Save Old Iron

I am betting your indicator pcb is the LED version with a grey wire on pin 6 on the 12 pin connector on top of the pcb.

 

If so, a 3 terminal TEST SWITCH will apply 12 volts to pin 6 on the pcb connector to lite the LED's.

 

looking at the schematic in post #7, the grey wire connected to pin 6 of the 12 pin pcb connector would apply 12 volts to six "steering" diodes, steering power to each one of six LED's when the TEST switch is depressed.

Edited by Save Old Iron

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