Tap into keyed (switched) power source

T2TRUE

MEMBER
1997 JEEP WRANGLER TJ
4.0L
6 CYL
4WD
MANUAL
210,000 MILES

I need to tap into a keyed power source for an external wiring harness. I have not been able to find a good solution under the hood. Where should I look to find a good power source for when key in run position?

Thanks

Thursday, October 19th, 2017 AT 12:36 PM

3 Replies

MHPAUTOS

MECHANIC
31,937 POSTS

Probe back of the fuse box for a switched power supply. Check the fuse information in your owners manual. You may have a spare fuse for such a purpose installed.

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Thursday, October 19th, 2017 AT 11:31 PM

T2TRUE

MEMBER
2 POSTS

Please clarify what "probe back of the fuse box" means.

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Friday, October 20th, 2017 AT 6:08 AM

KEN L

MASTER CERTIFIED MECHANIC
43,050 POSTS

Use a test light to check for power when the key is in the on position. How many amps are you looking for with the accessory you are using?

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please let us know

Cheers, Ken

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Saturday, October 28th, 2017 AT 7:44 PM