Possible dash 12v sources. Unused switch plugs? - JeepForum.com
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post #1 of 12 Old 01-02-2020, 12:09 PM Thread Starter
sycboi
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1997 TJ Wrangler 
 
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Possible dash 12v sources. Unused switch plugs?

I am restoring/rebuilding my ‘97 TJ. All wiring, 100% front to back top to bottom, has been converted to ‘99 wiring harnesses...

I am looking to wire in seat heaters. I would like to source the 12v power from unused switch plugs in the dash. I have a soft top so I don’t need the rear wiper or the hbl (rear defroster) switches in the dash. My dash harness is wired for them from what I can see. I will attach two pictures showing my fuse box and the plugs I believe are associated with the circled fuse locations. There is also a 3rd plug and I am not sure what it’s factory intended use would be for...

If I am on the right track I should be able to tie in to the power wires and insert fuses in the fusebox and be able to power up my seat heaters. Am I missing anything with my plan?

Any help will be greatly appreciated!

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post #2 of 12 Old 01-02-2020, 12:20 PM
2jhanna
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You could test your theory by using a volt meter at the plugs and insert fuses into the slots to see if you get power.

Also, what currents load is the seat heaters ? If more than 10a, be aware that wiring associated with F17 slot may be a smaller gauge. Even if you put a 15-20a fuse in the slot, the wire may be undersized.

Now you could use to control a relay that pulled in a heavier power source straight from the battery.

I am multi-talented, I can talk and piss you off at the same time.

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post #3 of 12 Old 01-02-2020, 12:34 PM Thread Starter
sycboi
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Quote:
Originally Posted by 2jhanna View Post
You could test your theory by using a volt meter at the plugs and insert fuses into the slots to see if you get power.

Also, what currents load is the seat heaters ? If more than 10a, be aware that wiring associated with F17 slot may be a smaller gauge. Even if you put a 15-20a fuse in the slot, the wire may be undersized.

Now you could use to control a relay that pulled in a heavier power source straight from the battery.
On high they pull about 5 amps each, from everything I have read. So hopefully they can be wired right in to the dash wiring and be good to go...

Unfortunately my main wiring harness is being built by HotwireAuto so I don’t have any under hood wiring. Nothing is coming into the tub at all, wiring/power wise...

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post #4 of 12 Old 01-02-2020, 12:52 PM Thread Starter
sycboi
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Quote:
Originally Posted by 2jhanna View Post
You could test your theory by using a volt meter at the plugs and insert fuses into the slots to see if you get power.
I am going to use my little multimeter and see what I can figure out...

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post #5 of 12 Old 01-02-2020, 03:54 PM
Jonny Jeep
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At the connector labled 17 the dark blue/red wire is the one from the fuse. At connector '6' the brown/pink wire is from the fuse.


On both of the connectors, black is ground, orange is illumination.


The third black plug is the front fog lamp switch connector.
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post #6 of 12 Old 01-02-2020, 06:27 PM Thread Starter
sycboi
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Quote:
Originally Posted by Jonny Jeep View Post
At the connector labled 17 the dark blue/red wire is the one from the fuse. At connector '6' the brown/pink wire is from the fuse.


On both of the connectors, black is ground, orange is illumination.


The third black plug is the front fog lamp switch connector.
You just answered about everything else I needed to know. Thank you good sir!

I have been googling for two days trying to get those very answers. Amazing how sparse detailed information like that is in forum discussions. I even downloaded electronic versions of the ‘97-‘99 TJ factory parts manual and the ‘99 TJ shop manual and have been going page by page searching for the wiring schematics...

Several members, Yourself, 2jhanna, mukluk, etc are absolutey invaluable with your help on this TJ page!
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post #7 of 12 Old 01-03-2020, 03:04 AM
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With the wiring sections of the FSM, have a look at section 8W-01 General Information. That will explain how to read/use the wiring diagrams.
The 8W-90 Connector/Ground Location section has diagrams that show most connector but not all connector locations. Using that can help find unknown plugs by location.
8W-80 Connector Pin-outs will then tell you what all the wires are going into the plug.
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post #8 of 12 Old 01-03-2020, 11:38 AM Thread Starter
sycboi
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Quote:
Originally Posted by Jonny Jeep View Post
With the wiring sections of the FSM, have a look at section 8W-01 General Information. That will explain how to read/use the wiring diagrams.
The 8W-90 Connector/Ground Location section has diagrams that show most connector but not all connector locations. Using that can help find unknown plugs by location.
8W-80 Connector Pin-outs will then tell you what all the wires are going into the plug.
Thank you for the direction. I think I’ve got the hang of it now. I just need a bigger screen for viewing, lol...

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post #9 of 12 Old 01-05-2020, 04:15 PM
henderson49
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Seat Heater wire

On my 2004, I used #19, it was an extra circuit per the wiring diagram. It is switched with the ignition, but test this with your multi meter. You will want to be sure it is switched so you don't leave it on accidentally. Mine pull 5 amps each, which is fine as it is a 20 amp circuit. I put a 10 amp fuse in for each seat.
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post #10 of 12 Old 01-06-2020, 03:48 AM Thread Starter
sycboi
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Quote:
Originally Posted by henderson49 View Post
On my 2004, I used #19, it was an extra circuit per the wiring diagram. It is switched with the ignition, but test this with your multi meter. You will want to be sure it is switched so you don't leave it on accidentally. Mine pull 5 amps each, which is fine as it is a 20 amp circuit. I put a 10 amp fuse in for each seat.
I used fuse locations #6 and #17 as I wasn’t using those connections for their intended purposes anyways. Both are switched on with the key so all is well there. I installed 10 amp fuses at both locations (#6 was originally a 20 amp circuit and #17 was originally a 10 amp circuit so I am ok there as well). My “free” auxiliary circuit location, I already used, was fuse #18. It is hot all the time. I used it for the auxiliary port on my switch panel (I updated my dash to an ‘04 setup)...

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post #11 of 12 Old 01-06-2020, 05:07 AM
jay-h
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I would suggest, while you have it in process, add a new fuse/connection panel, powered directly (or switched by relay) from the battery. As you add more goodies, it's a lot less trouble.
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post #12 of 12 Old 01-06-2020, 08:33 AM Thread Starter
sycboi
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Quote:
Originally Posted by jay-h View Post
I would suggest, while you have it in process, add a new fuse/connection panel, powered directly (or switched by relay) from the battery. As you add more goodies, it's a lot less trouble.
I appreciate the suggestion. Thank you...

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