The Ford Barn

bobpo1 · 04-20-2016, 08:58 PM

Why is it that when I start Miss Tilly, the Ahooga Horn will not sound right until I rev the engine a couple of times? After starting, the ammeter shows negative until revving the engine, then it pops right up to center and the horn sounds great.

J Franklin · 04-20-2016, 09:02 PM

An alternator?

Bob C · 04-20-2016, 09:58 PM

The points in the cutout have to close.

Bob

Tom Endy · 04-21-2016, 12:55 AM

The voltage level of your battery is lower that that of the generator or alternator you are running. When it kicks in the voltage level available to the horn is higher. You might try turning the adjuster on the horn down a click or too see if it will work just from the battery.

You could also try cleaning the battery ground strap where it attaches to the frame. Also clean the area of the frame where the strap bolts to.

Tom Endy

Tom Wesenberg · 04-21-2016, 05:29 AM

It sounds like you are using a one wire alternator that needs to be revved up to kick in.

A good generator should start charging the battery and kick in the cutout at about 500 engine RPM, which is idle speed.

BRENT in 10-uh-C · 04-21-2016, 06:27 AM

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Quote:

Originally Posted by Tom Wesenberg

It sounds like you are using a one wire alternator that needs to be revved up to kick in.

.................

04-20-2016, 08:58 PM	#1
bobpo1 Senior Member Join Date: Jan 2012 Location: NW Ohio Posts: 301	Delayed Ammeter Why is it that when I start Miss Tilly, the Ahooga Horn will not sound right until I rev the engine a couple of times? After starting, the ammeter shows negative until revving the engine, then it pops right up to center and the horn sounds great.

04-20-2016, 09:02 PM	#2
J Franklin Senior Member Join Date: May 2010 Location: Oregon Posts: 5,966	Re: Delayed Ammeter An alternator?

04-20-2016, 09:58 PM	#3
Bob C Senior Member Join Date: May 2010 Location: So Cal Posts: 8,756	Re: Delayed Ammeter The points in the cutout have to close. Bob

04-21-2016, 12:55 AM	#4
Tom Endy Senior Member Join Date: May 2010 Location: Southern California Posts: 3,131	Re: Delayed Ammeter The voltage level of your battery is lower that that of the generator or alternator you are running. When it kicks in the voltage level available to the horn is higher. You might try turning the adjuster on the horn down a click or too see if it will work just from the battery. You could also try cleaning the battery ground strap where it attaches to the frame. Also clean the area of the frame where the strap bolts to. Tom Endy

04-21-2016, 05:29 AM	#5
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Delayed Ammeter It sounds like you are using a one wire alternator that needs to be revved up to kick in. A good generator should start charging the battery and kick in the cutout at about 500 engine RPM, which is idle speed.