 Powering a light with two different sources of 12 Volt power, one doesn't affect the other |
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| Tom |
 Sep 22 2012, 01:48 PM
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Advanced Member  Group: Members Posts: 2,139 Joined: 21-August 05 From: Port Orchard, WA 98367 Member No.: 4,626 Region Association: None  |
Possible by using two steering diodes. I believe 1N4001 diodes will support 1 amp. Should be more than enough for a small indicator lamp.
Jim, one power from relay ( black/yellow), other from fan. Tom Attached thumbnail(s) 
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| jim_hoyland |
Sep 22 2012, 03:47 PM
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Get that VIN ? Group: Members Posts: 9,319 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California 
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I am attempting to use some of the CAT wiring to turn on the CAT light ( it's a 75 ) when the oil cooler fan comes on.
CAT light always comes on at start up, then goes out when engine is started. The CAT sensor is not Kinstalled. My thought is to use the wiring that goes from the rear trunk to the dash to indicate the fan is on. Here's a wiring diagram of the harness in the rear trunk. There is a relay involved. I'm also thinking it will be easier to run a wire from the fan through the tunnel and jump into the CAT light connector too. ** I previously referred to this as the EGR circuit, but was mistaken. This is the circuit found in the rear trunk with a pair of wires going to the sensor Attached thumbnail(s) 
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Posts in this topic
Tom Powering a light with two different sources of 12 Volt power Sep 22 2012, 01:48 PM
tradisrad If the EGR indicator is nonfunctional disconnect i... Sep 22 2012, 05:08 PM
jim_hoyland
If the EGR indicator is nonfunctional disconnect ... Sep 22 2012, 05:52 PM Cap'n Krusty Had me baffled for a moment, then I decided you me... Sep 22 2012, 05:09 PM tradisrad I bought the LED at Frys Electronics. I was sure t... Sep 22 2012, 09:06 PM kg6dxn
Possible by using two steering diodes. I believe ... Sep 22 2012, 09:11 PM Tom Mike,
Yes, two different power sources to li... Sep 23 2012, 02:02 AM |
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