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Jul 21st, 2025 | | | | Joined: Mar 2010 Posts: 295 'Bolter | | 'Bolter Joined: Mar 2010 Posts: 295 | I have a 53 Chevy truck with a 235
I just went through the engine block cleaning and unclogging the block drain.
I have a new radiator with an electric fan that will be going in soon.
I want to install a toggle switch to bypass the temperature sensor to turn on as needed I was told I need to install a diode between the fan and the temp sensor so not to send a reverse current to the sensor or relay.
Thanks
Last edited by latroca52; 03/07/2024 3:10 AM.
This is no longer fun
| | | | | Joined: Oct 2021 Posts: 5,684 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 5,684 | Here's the link without all the junk. I learned here that everything from the ? on is not necessary. https://www.etrailer.com/Accessories-and-Parts/Hopkins/48955.html
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1956 Cadillac Sixty Special Fleetwood (The Godfather) | 1966 Oldsmobile Toronado (The Purple Knif) | 1966 Ford Mustang (Little Red) | 1964 Ford Galaxie 500 coupe | 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
| | | | | Joined: Apr 2004 Posts: 5,139 Authorized Pest | | Authorized Pest Joined: Apr 2004 Posts: 5,139 | Yes Otto. That's the tracking info. Always check with a preview. ðŸ‘
Last edited by Peggy M; 03/07/2024 6:42 AM.
~ Peggy M 1949 Chevrolet 3804"Charlie" - The Stovebolt FlagshipIn the Gallery || In the Gallery Forum"I didn't see this one coming. I don't see much of anything coming. :-O" | | | | | Joined: Jul 2000 Posts: 2,115 Insomniac | | Insomniac Joined: Jul 2000 Posts: 2,115 | I have a 53 Chevy truck with a 235
I want to install a toggle switch to bypass the temperature sensor to turn on as needed I was told I need to install a diode between the fan and the temp sensor so not to send a reverse current to the sensor or relay.
Thanks No diode needed. e.g. https://enginedburner.z19.web.core.windows.net/electric-fan-relay-wiring-schematic.html
Gord 🇨🇦
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1954 1/2 ton 235 4 speed
| | | | | Joined: Mar 2021 Posts: 389 'Bolter | | 'Bolter Joined: Mar 2021 Posts: 389 | I concur this is how mine is wired you are really just creating the ground to trigger a manual start. No different than the thermal switch does. and it cares less if its got a connection on either side.
the previous post link shows it well done. | | | | | Joined: May 2005 Posts: 8,988 Sir Searchalot | | Sir Searchalot Joined: May 2005 Posts: 8,988 | 1. Don't know if you are talking about the temp sensor/sender on motor for gauge (which is mechanical) or the fan thermostat switch?
2. "I was told I need to install a diode" by whom?
3. Wire it per the instructions from fan company. I don't see any diagrams showing a diode. If diode fails, you won't know it.
4. If you need a fan on a 235 with a new radiator, you got problems.
5. You don't mention a relay?.....or fuses. These are your safety items.
6. Let the fan turn itself on....
Last edited by bartamos; 03/09/2024 5:38 AM.
| | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | If you choose to install a bypass switch to override the temp sensor, be sure to power it from a source such as the "accessory" terminal on the ignition switch. That way it's sure to shut off when the engine stops, even if you forget to switch off. I've seen batteries run down by leaving accessories turned on with an override switch when the driver leaves the override on accidentally.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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| | | | | Joined: Mar 2010 Posts: 295 'Bolter | | 'Bolter Joined: Mar 2010 Posts: 295 | Sure will thanks Jerry and everyone else for expertise advice
This is no longer fun
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