Classic cars forum & vehicle restoration.

FAB Cruiser · Joined: 03 Jul 2008 Posts: 77

I'm putting an alarm in my car. A 57 Zephyr converted to negative earth.

It has a pair of wires for 'starter immobilisation'. This circuit will be closed when the alarm is off and open when the alarm in on to stop the started motor working. The two wires are quite heavy duty.

Should I use them to interrupt:

a) The cable from the solenoid to the starter
b) The cable from the ignition switch to the Solenoid
c) The cable from the battery to the starter solenoid
d) The cable from starter solenoid to the voltage regulator

Probably more dumb questions to follow!!

Thanks
David

peter scott · Joined: 18 Dec 2007 Posts: 7124 Location: Edinburgh

My vote goes for b.

Peter

wrinx · Joined: 22 Jun 2008 Posts: 142 Location: Derbyshire

I'd say B as well.... Very Happy

Mine had what looks like a DIY pull switch immobiliser which isolates the coil and fuel pump Confused

Car will still turn over but not run...which is useful at times. When it's not been run for a while I'm able to crank it over to get some oil pressure prior to starting Very Happy

wrinx
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Greeney in France · Posted: Sat Jul 05, 2008 7:39 pm Post subject:

I tend to use the Low tension circuit as immobiliser, the wire from the dissy to the coil
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Greg · Joined: 03 Dec 2007 Posts: 445 Location: Dreamland Margate

I would cut 'b' or as Greeney says the L.T side of the Coil as the older cars usually draw more current than the modern stuff. Most good Immobiliser relays are only rated at 30 amps!