View Full Version : What model is this, and what pedestal does it need?

Kevin Lynch
01-02-2017, 06:14 PM
I think I had one of these in my 66 GMC rescue truck. It has no brand or model markings. Does it have a shell? A pedestal????? I'm thinking of using it.
Thanks in advance!!!!
Kevin Lynch

Dan Brintlinger
01-02-2017, 07:00 PM
Maybe a Mars siren? They did make some............?

Paul Steinberg
01-02-2017, 07:29 PM
That is a Federal DuoTone siren. From the front grille, it should have a chrome rear shell, and a 2 or 4 bolt base. If it were a under hood siren, then it would use the base that the Model 28 under hood sirens used. Depending on how you intend to use it, will determine what additional parts you are going to need. If you use it as a under hood siren, then you will need a cover for the open rear where the brushes are located. If you decide that you want to use it as an external siren, then a rear cover will be needed, and an appropriate base.

John ED Renstrom
01-02-2017, 09:19 PM
and if you don't want to use I'll take it off your hands it would go nice under the hood of this 67

Kevin O'Connell
01-03-2017, 07:46 PM
As Paul mentioned, you have a 1947-57 Federal 76A. The nameplate would have been on the missing brush inspection cover. These used an Autolite MBB Motor for which brushes are no longer available. I reproduce the bases, and may eventually have the brushes reproduced. The bases are $30.00 plus shipping.

Kevin Lynch
01-03-2017, 08:58 PM
I found the base. I can mount it concealed, although I'm considering mounting a siren if I can find the motor cover - which I'll post separately.
Thanks again everyone!

Kurt Arends
01-03-2017, 09:02 PM
So, this is a 6 volt siren then??

John ED Renstrom
01-03-2017, 11:08 PM
If your going to hide it a strip of tin and a big screw clamp is all you need for the brush cover

Kevin O'Connell
01-06-2017, 01:51 AM
So, this is a 6 volt siren then??

The motor would have to come apart to find out. These have four field coils. In the 12V version all four are in series. In the 6V version has two parallel sets of two in series.

Paul Steinberg
01-06-2017, 06:33 PM
Or put 6 volts to it, and it sounds normal, then in all probability, it is a 6 volt siren. The other alternative, is to "bump" it with 12 volts, and if it takes off screaming, then you know it is a 6 volt siren. Third thing to try (but do it first), is to remove the front light, and see what voltage the flasher and the bulb is. Normally, 6 volt sirens used a 6 volt bulb and flasher. If the bulb and flasher is 12 volt, and the siren screams on 12 volts, someone used the 6 volt siren on a 12 volt system, and converted the light, to 12 volt.