Thread: 302 Stroker??

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Originally Posted by Dave Severson

Geez, all this fancy electronics, and I still have a cable drive Moroso tach on the shelf!!!!!! (Saving it for just the right project, I guess)....

Oh Sure! NOW you tell me!!!

Yep Dave--I got one of them also plus an original iron fuel injected corvette distributor to drive it with----

OK---on the corvette, and others , wipers ar a completely different sort of device, especially since they continue to run to the park position after you turn them off---------


On an electric fan set up, that is an incorrect method of wiring, and the reason is because of the fans being able to induce some current into there feed wires since they are actively still hooked up----

You really need to wire it so the relay opens and closes the contacts for the live feed wire to the fan and control the circuit in the relay that closes that contact.

I understand that lots of situations will control the ground side of an circuit because the ampereage is lower, however, generally speaking, maintain solid , constant grounds to the chassis for the complete return of the circuit---

Originally Posted by jerry clayton

OK---
You really need to wire it so the relay opens and closes the contacts for the live feed wire to the fan and control the circuit in the relay that closes that contact.

I understand that lots of situations will control the ground side of an circuit because the ampereage is lower, however, generally speaking, maintain solid , constant grounds to the chassis for the complete return of the circuit---

The purpose of a relay is to control the big amps, it takes that load off the switch or sensor. I do not ever remember seeing relays wired after the load/motor whatever. The wiper parking can be controlled with a timed circuit, consisting of a cap and resistor, keeping the relay energized after turned off @ the switch.

I was going to write a dissertation of sorts but that will defeat what I wanted to achieve. The wiper connection on the corvette was to show that even the big 3 sometimes do things we may not usually see. They used electric/mechanical switches in line to control the wiper motor and this was all done on the ground circuit was all I was trying to say.

As I also said earlier, while I know it is possible to induce a stray voltage (and I never said it had to be 12 volts!) it could be induced and "act" out of phase! This would cause the gauges to go flukey! So as I said, I do not believe this to be the reality, I was searching for someone who had experienced this.

The example of the plug wire was only to show that it can happen even at a voltage high enough to jump a spark plug gap!

As far as my fan wires being "in-correct....?" Hmmm.. I'll agree it's unconventional... for a car!

And I'll say thanks to all for participating! I loved all the ideas and directions, if it happens again - I'll update the thread and see if anyone cares! ROFL..

Dakota Digital seems to think switch on the ground side is ok, too!!!!



The relay coil is what is activated to perform the “switching” action. The coil is
located between pins 85 and 86. When the relay coil is energized, pins 87 and 30 will be
connected. When the coil is off there will be a connection between pins 87a and 30.
There are two ways to energize the coil, switching power to the coil or switching ground
to the coil.
Most of Dakota Digitals products that require an external relay are ground
switching, meaning that the relay control goes to ground when activated. So for these
types of outputs one side of the relay coil needs to be connected to +12V power, and the
other side to the grounding output of the controller. Figure 2 shows how to connect a
single relay pack in this fashion. The relays in Figures 2-7 will supply +12V power to
the solenoid, or load, as long as the control output is grounded. This would be a good
application for fans, fuel pumps, and other motors.
The green fused +12V power wire should connect direct to the battery to provide
a good power source for the desired load. An appropriate gauge wire should also be used
for the +12V supply. The black “switched power” wire should also use an appropriate
sized wire to supply power to the load. The red and white coil connection of the relay
can be smaller gauge wires, around 22 AWG,since there is relatively low current draw.

Not meaning to confuse anyone anymore than they already are.

A switch is a switch, which side of the device it is attached to does not determine the amount of the load (amperage). The load (current draw) on the switch is the same regardless the side of the device it is attached to.

In house type wiring switches are attached before the devise as this arrangement will allow the switch to operate as a disconnect of the main power to the device, which is safer for the consumer. But remember older homes (pre- 50’s) did not have earth ground and the wiring was not polarized as it is today, thus switches in these older homes can be on either side of the devise, which presented a shock hazard that was later corrected by building codes.

Car voltage is much lower and normally does not present a shock hazard, consequently switches are often on either side of the device they are intended to control with no determent. When the switch is in the off position there is no load on the device regardless the side of the devise the switch is on, a circuit must be completed to establish a load.

This is not to say a switched devise can not make electrical noise in the off position, it can in the case of the DC fans being spun by other means (generator effect), regardless the side of the devise the switch is attached to, as noise can travel through ground as well as power. However, this type of noise normally has no ill effect on most analog circuits used in our older cars other than a little whining noise in our music. Digital devices are different and they require other means of protection, which in most cases is built in by the manufacturer.

I thought I'd share with you my birthday present to myself! I couldn't afford anything like this when I was a kid so I figured it's a bit of a luxury but what the hell!

Yes, Charlie! I'll be having ice cream right after supper!! (cake too!)

Happy Birthday, nice cake!

WooHoo!! Happy Birthday, Mike!! That will hold a lot of ice cream!

Thanks! it's a good lookin' piece and almost a shame to hide it under a car! LOL..

Now, more Ice Cream!

Originally Posted by 34_40

Thanks! it's a good lookin' piece and almost a shame to hide it under a car! LOL..

Now, more Ice Cream!

If you keep eating all that ice cream you can just hide it under the shadow of your belly.....

Originally Posted by randyr

If you keep eating all that ice cream you can just hide it under the shadow of your belly.....

Yeah, Yeah, Yeah.... I know... stop rubbing it in!!! 8-)

Originally Posted by 34_40

Yeah, Yeah, Yeah.... I know... stop rubbing it in!!! 8-)

Hmmmm......rubbing it in would be considerably less fattening than eating it I suppose...... but hey, it's your birthday!!! Eat it!!!

Now you're just being silly! HAH!