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10-23-2014, 09:36 PM | #1 |
Another Day, Another Dollar
Join Date: Nov 2008
Location: North Vancouver, BC
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How to slow down relay cycle time
Hi guys,
I have installed 2 Grote amber marker lights on the front of my jeep. I want to use them as both daytime running lights and turn signals. Here is the problem: The only amber lights that I can find only have a positive and a negative lead. I cannot find any 3 way amber lights so I drew up this schematic for a 5 pin relay: The DRL module feeds the main power for the relay, the old turn signal wire feeds the signal for the relay coil. When there is no turn signal 87a is energized by the ignition power and feeds the marker, when the signal cycles the 87 terminal is energized and feeds a pulse to the lights. This all looked great on paper but there is one problem: the relay cycles so fast that you can barely see a flicker of the turn signal!! Is there any way I can add a capacitor or use a different style of 5 pin relay or add something inline to the relay signal wire to slow down the cycle time?? Thanks, spencer
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-78 K20 Cheyenne 454 long box, 4" lift, 35" MT's, '84 cab, '80 box "its hip to be square" |
10-24-2014, 12:37 PM | #2 |
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Re: How to slow down relay cycle time
take the wire off of 87
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10-24-2014, 06:55 PM | #3 |
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Re: How to slow down relay cycle time
So the signal from the flasher goes to 86?
Put a current limiting resistor in series w/ the coil. The signal flasher runs off heat generated by current. Less current means slower flashing. I would actually think it would flash too slow based on my understanding that a relay coil doesn't draw much, but its worth a shot |
10-24-2014, 11:03 PM | #4 |
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Location: Brandon, Manitoba, Canada
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Re: How to slow down relay cycle time
With the ignition power going to the relay #87, you won't have DRL's. #87 is open when the relay is at rest. Connect ignition to #87a, which is closed with the relay at rest, then the DRL's will be on until the relay is flashed on. As a two-prong flasher will not flash a relay alone, if you are also flashing a bulb (rear turn signal), the relay flashes fine. I just hooked up this circuit on my bench and it worked OK, although the front clearance / daytime running light flashes opposite to the rear turn signal, which should not be a problem. And it was a nice normal flash, not fast at all.
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Bob 1967 2wd Burb, 350/TH350, 3.73 posi |
10-24-2014, 11:30 PM | #5 |
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Re: How to slow down relay cycle time
You will, of course, need a relay for each side. Here's what I did:
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Bob 1967 2wd Burb, 350/TH350, 3.73 posi |
10-25-2014, 01:02 AM | #6 | ||
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Re: How to slow down relay cycle time
Quote:
Do that and your set, right now with the light connected to both 87 and 87a you basically switching the light from "on" to "on". removing the wire at pin 87 you interrupt the circuit every time the relay is energized.
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10-25-2014, 01:16 AM | #7 |
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Re: How to slow down relay cycle time
Yeh, I wondered about Willett's diagram as well, with the light connected to both #87 and #87a giving an ON / ON scenario. It worked fine the way my diagram shows using #87a only.
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Bob 1967 2wd Burb, 350/TH350, 3.73 posi |
10-25-2014, 10:43 AM | #8 |
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Re: How to slow down relay cycle time
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cool, an ogre smiley Ogre's 58 Truk build how to put your truck year and build thread into your signature shop air compressor timer |
10-25-2014, 08:39 PM | #9 |
Another Day, Another Dollar
Join Date: Nov 2008
Location: North Vancouver, BC
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Re: How to slow down relay cycle time
Thanks for the input guys. I'll give er a go tomorrow
My logic with splicing 87 and 87 a was that there would be some Delay as the coil energized but there isn't nearly enough! Here's Willis Here's a willy's I just Completed a frame and tub Replacement. next I'm going to stencil a big white star on the hood and doors
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10-31-2014, 12:34 AM | #10 |
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Re: How to slow down relay cycle time
So, Willett, did you get a chance to have a go at those DRL / turn signal lights?
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Bob 1967 2wd Burb, 350/TH350, 3.73 posi |
10-31-2014, 11:28 AM | #11 |
Another Day, Another Dollar
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Re: How to slow down relay cycle time
I never got a chance last weekend. Hopefully I will be able to get user the hood this weekend.
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-78 K20 Cheyenne 454 long box, 4" lift, 35" MT's, '84 cab, '80 box "its hip to be square" |
11-18-2014, 10:00 PM | #12 |
Another Day, Another Dollar
Join Date: Nov 2008
Location: North Vancouver, BC
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Re: How to slow down relay cycle time
Finally got around to wiring it up. Works like a charm, thanks guys!
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-78 K20 Cheyenne 454 long box, 4" lift, 35" MT's, '84 cab, '80 box "its hip to be square" |
11-19-2014, 01:51 AM | #13 | |
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Re: How to slow down relay cycle time
Quote:
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Bob 1967 2wd Burb, 350/TH350, 3.73 posi |
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