? about a relay - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #1 of 6 (permalink) Old Apr 23rd, 16, 9:35 PM Thread Starter
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John
 
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? about a relay

Just a thought - would the tach output from an MSD box work as the 'trigger' or switch to activate a relay?
John

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post #2 of 6 (permalink) Old Apr 23rd, 16, 10:04 PM
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Re: ? about a relay

If the relay can read the tach signal. What are you trying to activate?

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post #3 of 6 (permalink) Old Apr 24th, 16, 7:41 AM
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Re: ? about a relay

Not likely. As its name suggests, it is a "signal", which is usually a low current AC type signal. Relays want either a solid DC voltage or a solid AC voltage, not a light duty signal.
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post #4 of 6 (permalink) Old Apr 24th, 16, 8:15 AM
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Re: ? about a relay

A shift light could trigger a relay.

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post #5 of 6 (permalink) Old Apr 24th, 16, 8:54 AM Thread Starter
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Re: ? about a relay

Quote:
Originally Posted by LevonH View Post
If the relay can read the tach signal. What are you trying to activate?

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Thanks for the answers. Those switches require a minimum (usually 1000rpm) or are 'window' switches. I was looking at an easy way to set up a safety shutoff for the fuel pump. I guess I am stuck with an oil pressure activated one. NBD , just a PITA to instal with header clearance and all. My EFI used a tach signal, that is why I asked.
John

'67 Elky - 496 / TH400
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"Democracy is two wolves and a lamb discussing what's for dinner. Freedom is a well armed lamb contesting the vote" Benjamin Franklin

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post #6 of 6 (permalink) Old May 1st, 16, 7:21 PM Thread Starter
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Re: ? about a relay

Update:

I knew somebody had to be making these. A fuel pump safety switch that operates off the engine tach signal. Just FYI to anyone else looking.

Fuel Pump Safety Switch

John
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