Electric Fan Relay ???????? Why was this don?

[ARMAGEDON]

Electric Fan Relay ???????? Why was this done?

Before I install an A/C Fan Control Relay, I have a ? about the # 85 on the current electric fan set up.

I traced the wires from the relay that the previous owner put in. There is no A/C Fan relay, only the 75 amp relay for the fan to kick on with the thermostat.

The relay connections are as follows:

The relay is a Tyco 75 amp # V23232-D0001-X001

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#85 wire goes to the positive terminal on the MSD Coil, the exposed wire is just wrapped around the + terminal and the plug clicks down and holds the 85 wire in place. I don't understand why he did this. What is the point of this? I thought 85 was for an optional toggle switch.
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#86 to water temp sensor
#87 to fan
#30 to Battery + terminal
There is a jumper wire connecting the two wires directly off the fan together.

A couple ?s:

Why the #85 connection to the MSD Coil +? &
What kind of A/C Fan Control Relay would you use?



Thanks.

 

[HISSIN50]

The 85 and 86 wiring looks like it's reversed. 86 should go to the accessory source (your coil's + wire) and 85 should go to a grounding source (your controller's negative output).

The jumper on the fan motor is probably a diode.

I'd use a 40 amp SPST or SPDT relay. I returned your PM with an example of such a relay and a more detailed reply.

Good luck.