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Dual 87 pin relay
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plymouth
Posted 2017-11-18 8:56 AM (#552587)
Subject: Dual 87 pin relay



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Location: McComb, Mississippi		I have purchased a harness for a dual 87 pin relay. I am using one of the 87 terminals currently to power the electric choke. It is triggered by the ignition run wire. The relay and electric choke are properly fused, but I do have a question. I have recently added Mopar electronic ignition. I would like the module to receive full 12 volts and eliminate the possibility of voltage drop through the old wiring. So, I am thinking I will power up the ignition control module and the 12 volt side of the ballast resistor with the extra 87 pin on my 5 pin relay. If I do this, should the wire be fused? I would also have to decide which pin I would use to supply the voltage regulator with 12 volts. I would like to hear some of your suggestions on this matter. BTW I'm also going to use two 5 pin relays and automatic reset circuit breakers so I can get brighter lights and take some of the load off of the headlight switch and original wiring.
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56D500boy
Posted 2017-11-18 10:45 AM (#552594 - in reply to #552587)
Subject: Re: Dual 87 pin relay



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Location: Lower Mainland BC		I have an Echlin electric choke on my 56 Dodge D500 (came that way when I bought it). The relay is an Echlin 5 pin "potted" (no external pins, just wires coming out of the relay). I am also running a Pertronix ignition with a Pertronix Flamethrower coil which can handle the full 12V all the time (no need for the ballast resistor).

As for the voltage to the coil that comes from that relay to the coil, I simply jumpered around the ballast resistor (I left it mounted in the event I need to put my NOS dual point distributor in for some reason).

In the photo below, you can just see the Echlin relay behind the rad hose. The wires are inside an aftermarket woven nylon sheath. The 12V input wire to the relay is from the original harness (and not fused per say). You can also see that there are not wires electrically connected to the ballast resistor.



Edited by 56D500boy 2017-11-18 10:51 AM




(DaveFsD500EngineWithFaked315HemiHeadVinylSticker.jpg)



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Attachments DaveFsD500EngineWithFaked315HemiHeadVinylSticker.jpg (174KB - 131 downloads)
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plymouth
Posted 2017-11-18 9:47 PM (#552647 - in reply to #552587)
Subject: Re: Dual 87 pin relay



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Location: McComb, Mississippi		Thank you very much. My main question is, should the wire for the run side of the ballast resistor be fused if I use a relay. If so, what amp relay would you recommend?
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56D500boy
Posted 2017-11-19 12:37 AM (#552656 - in reply to #552647)
Subject: Re: Dual 87 pin relay



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Location: Lower Mainland BC
plymouth - 2017-11-18 9:47 PM
Thank you very much. My main question is, should the wire for the run side of the ballast resistor be fused if I use a relay. If so, what amp relay would you recommend?


I doubt that you need a fuse but *IF* you did, I would fuse going into the relay. As for amperage, I would go with a 30 amp relay. Probably overkill.

Good luck.

Found these instructions on the internet (eBay):

Solid State Electric Choke Kit #2439 Rochester & Holley 4BBL





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plymouth
Posted 2017-11-19 1:53 AM (#552659 - in reply to #552656)
Subject: Re: Dual 87 pin relay



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Location: McComb, Mississippi		Thank you so much for the pictures and the information. I just needed a little clarification.
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