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Old 24-03-2014, 09:40   #1
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Location: Wexford, Ireland
Boat: Seamaster 27
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Connecting an ammeter

Hello guys,
I want to fit an ammeter on my Seamaster 27 (Perkins 4108) ca. 1972. I have the ammeter, the instructions say to ''connect into the red wire going from the alternator to the battery''. Here's my problem; the red wire goes to a small 'battery' shaped dashboard light, then back to the battery. This light comes on as part of the ignition when starting, the sequence when the key is turned is: on, battery light, hold for glowplugs, then start. Can I remove this light and replace it directly with the ammeter? Any advice appreciated.

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Old 24-03-2014, 09:56   #2
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Re: Connecting an ammeter

Look for the other red wire--the thicker one.

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Old 24-03-2014, 11:12   #3

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Re: Connecting an ammeter

Do not remove the alternator warning light. It usually is required for proper operation. Most alternators will have a small two- or three-pole electrical connector, one of which goes to the warning light. And then a totally separate red or white wire, which goes from an isolated stud on the alternator directly to the battery or starter motor.
Take another look for the output wire, it should not be the one that goes to the warning lamp. Or look the other way, start from the battery positive cable and then trace back until you find a wire going to the alternator output post.
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Old 24-03-2014, 12:27   #4
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Most ammeter these days use a shunt in the main alternator cable. But...I have a 4108 which has a heavy duty ammeter connected into the main cable. I'm currently replacing it. Too much amperage wandering around near the gauges!
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