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Old 22-12-2014, 20:44   #1
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Perkins 4108 - Wiring diagram

Hi Everyone

Anyone that can help me with a wiring diagram for a Perkins 4108 ? It uses the standard Perkins wiring loom . I just overhauled it and replaced the alternator - also some help of how to connect the rencounter to the alternator - is installed in a Baltic 42 DP

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Old 23-12-2014, 04:47   #2
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Re: Perkins 4108 - Wiring diagram

This is what I have. I didn't mark it but the 1 circled is the input from oil under pressure and temp high sensors which are not the same as the monitoring gauge sensors. On my unit it was/is a separate wire. According to Mainsail it is best to get rid of the connector, which I will be doing. Universal Diesel Wiring Harness Upgrade Photo Gallery by Compass Marine How To at pbase.com

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Old 23-12-2014, 05:13   #3
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Re: Perkins 4108 - Wiring diagram

Here Perkins Wiring Diagram - Wiring Diagram - PERKINS Cruisers & Sailing Photo Gallery
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Old 23-12-2014, 06:00   #4
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Re: Perkins 4108 - Wiring diagram

With few exceptions on 4-108 The Tachometer (revcounter) gets it's signal from the "AC" connection on the alternator. If your alternator does not have one any rebuild shop can add one. The tacho should be calibrated using a photo or handheld tach.
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