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MG TD TF 1500 - Heater Electrical Connection

Where is the best place to hook up the heater switch where it's not hot when the key is off? Since the ignition switch has no auxiliary connection and the switch wire appears to go to the coil, is there another place I can get switched juice without interrupting the coil circuit? PJ
Paul161

Paul, any green wire. The A4 terminal of your fuseblock is convenient. Bud
Bud Krueger

Thanks Bud, I thought it was a green wire but it's been a while since I wired this car and forgot. Just wanted to make sure. PJ
Paul161

I added a small relay in the circuit to prevent an overload on my ignition switch. The radio is connected that way as well. It's nice to leave the TD knowing that the battery will not be discharged.
Bud Krueger supplied the info to get the job done.
Thanks again Bud.
Jim Merz

Here's a picture of the relay installation after the job was done.

Jim Merz

Yes, use relay, likely too much draw directly through the switch.
George Butz

Here's the heater and not so good shot how it is mounted. The hoses, wiring and bracing are are all hidden with the under cover which I had to cut into two pieces to go over the heater. It all came out looking good. I had an antique variable switch from a 1940s car and that works very well. The bracket is 1/8th plate with a 90 degree bend on the bottom. Clamped to the bar and three mounting holes in the bottom. Pretty much how a Triumph heater is mounted. Shame the TF doesn't have the room as a TD does, which is the reason for the horizontal mount. PJ

Paul161

Another,



Paul161

Here's the old heater switch I used. I think it's about a 1946 or later. The heater is installed and works fine, gets very hot, but the fan is not the greatest for output. PJ


Paul161

Paul
I think you can get an uprated fan motor - if it becomes a concern.
Dave H
Dave Hill

Paul, does your switch control the speed of the fan? Bud
Bud Krueger

To follow up on my heater installation, here is a picture of my control panel. It contains both a rheostat type illuminated switch and a push/pull cable to control the coolant flow valve. So, I can set the fan speed to whatever I want as well as regulating the flow of the coolant to the heater from full blast to a trickle. The valve is located just behind the heater.

Jim Merz

Bud, Yes it does control fan speed. There's also a little light bulb inside that lights up the center of the knob. I tested the fan directly to the battery and there's no difference than on the switch turned full on. I'm assuming it's just a slow motor. PJ
Paul161

This thread was discussed between 21/08/2015 and 24/08/2015

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