relay question


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Bobsiler
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relay question

Postby Bobsiler » Tue Dec 22, 2015 8:35 am



I changed out my headlights to an HID kit from Cycle Max last week on my '88 1500. I wired in a relay to the oil pressure switch to delay the light startup. All worked fine except my oil pressure light stays lit very dimly. Not sure what I did wrong.
I wired the relay as follows
Terminal 86 Oil pressure trigger wire
Terminal 85 ground
Terminal 30 factory harness power in
Terminal 87 power out to lights



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Re: relay question

Postby WingAdmin » Tue Dec 22, 2015 11:38 am

How did you connect the relay to the oil pressure switch?

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Re: relay question

Postby Bobsiler » Tue Dec 22, 2015 11:41 am

I spliced into the oil pressure wire near the radiator

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Re: relay question

Postby virgilmobile » Tue Dec 22, 2015 12:54 pm

Your lamp is dim because the relay is providing a ground (of sorts).
Just a bit of rewiring needed.
Disconnect the relay ground wire and attach it to the headlight harness (your relay terminal 30).
Disconnect the HID wire from the relay terminal 87 and move it to the normally closed terminal 87a.(the middle terminal).
I'd also put a connector back on terminal 87 so it doesn't spark to ground.

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Re: relay question

Postby virgilmobile » Tue Dec 22, 2015 1:14 pm

Here the correct wiring to solve your issue.

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Re: relay question

Postby WingAdmin » Tue Dec 22, 2015 1:50 pm

virgilmobile wrote:Here the correct wiring to solve your issue.
IMG_20151222_121205.jpg


Where in that circuit is a ground being provided to the oil lamp? When the oil pressure switch opens, the relay connects the common to the normally closed, which connects the +12V to the HID lamp - which is also the same +12V applied to the one side of the relay coil. The other side of the coil is grounded through that oil pressure switch.

So there is no ground being provided, instead there is +12V being provided.

The only thing that I can think of is that the +12V being provided to the headlight is being run on insufficient (OEM?) wiring, which has a voltage drop when powering the 70 watts of headlight. As a result, it is making up for the power drop by pulling power through the oil pressure light.

The way around this would be the method I used, where this relay actuates a SECOND relay, which switches a 14 gauge wire coming right from the battery. This powers the HID lights bypassing the OEM headlight wiring. The headlight wiring is used only to power the relay coil. The relay coil is not going to draw enough to cause a voltage drop, so the oil pressure light won't glow.

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Re: relay question

Postby virgilmobile » Tue Dec 22, 2015 1:52 pm

Keep in mind that if your engine dies and the oil pressure lamp comes on,your HID power will be lost.

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Re: relay question

Postby WingAdmin » Tue Dec 22, 2015 2:02 pm

virgilmobile wrote:Keep in mind that if your engine dies and the oil pressure lamp comes on,your HID power will be lost.


Right. I made mine latching for that reason - once it's on, it stays on.

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Re: relay question

Postby Bobsiler » Tue Dec 22, 2015 2:31 pm

Thank you. I'll look into the secondary relay. I have a 5 pin and a 4 pin. My other option is abandon the oil presure switch and buy a delay relay. Couldn't find one of those without ordering it which is why I went the oil pressure direction.
The new HID kits are wired to go directly into the factory harness with no splicing so I assumed it would provide enough power.

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Re: relay question

Postby virgilmobile » Tue Dec 22, 2015 3:17 pm

The ground path for the relay is the oil pressure switch.Key on,relay energized,N.O. contact keeps HID off.Oil pressure comes up,relay de-energizes and power from the harness is passed to the HID.Switched ignition kills power to the relay.If there's not enough power from the harness,a second relay can be added to the circuit to switch battery power.
By the way,a standard relay does draw enough power to light the oil lamp dimly if its used to energize it by tapping the wire and grounding the other side.

A light duty relay can be used in this method..Perhaps a 12 volt 30ma coil and use its contacts to operate a large relay

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Re: relay question

Postby Bobsiler » Wed Dec 23, 2015 8:49 pm

Thank you both. Being a bit challenge in the electrical dept it took me bit to understand virgil's diagram. All I could see was 2 12volt sources connected. I get it now (I think) the relay is energized by the switched power and the oil pressure ground becomes power which de-energizes the relay. For some reason I couldn't wrap my head around it. However I didn't really consider if I loose oil pressure or just the switch itself while riding. So I looked around and found an adjustable time delay relay. $25 shipped to my door. 4pin 30A adjustable from 2 seconds up to 3 min. I won't get it for a few days but it should work. Now I wish I hadn't spliced the oil pressure wire.

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Re: relay question

Postby Bobsiler » Sun Dec 27, 2015 8:33 pm

I received my TD relay today. I can get it to trigger but it is instant, I seem to be unable to get any delay . Not sure if it's bad or if I somehow damaged it. Turning the adjustment screw seems to do nothing.
So I gave virgil's diagram a try and it works perfectly. The head light comes on and the oil pressure light is not lit. I left it that way for now but in the long run I think the delay may be a safer bet. Once energized the headlight stays on regardless until the key is switched off.
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virgilmobile
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Re: relay question

Postby virgilmobile » Sun Dec 27, 2015 9:17 pm

By generic info i just saw on utube.The relay is OK.When triggered,it closes the relay for the time set then opens.




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