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Old 19-11-2012, 18:16   #16
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Re: Start bank fuse size?

Would seem rather foolish to put all those breakers and fuses on the dinky 5 and 10 amp circuits and none at all on the 1000A starter circuit. "Yea, make sure you have a little glass fuse on the VHF so you don't get a lille smoke in the cabin if something goes wrong. But don't worry about that several thousand amp explosion in the engine room when the starter wiring fails."

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Old 19-11-2012, 18:36   #17
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Re: Start bank fuse size?

Originally Posted by ocean40 View Post
Ford lehman manual specifies a locked starter draw of 1070A and a running starter draw of 650A.
I looked and finally found this in the manual. So, now I want to find a fuse and fuse holder of about 700a. This should allow the starter to run, but blow on a locked rotor starter. Can you say "Hydrolocked"?

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Old 19-11-2012, 18:48   #18
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Re: Start bank fuse size?

A good reminder to check:

1: Is the always "hot" red starter wire insulation chafing on some vibrating piece of the engine such as a mount?

2: Is the nut holding it to the starter truly tight with a locknut.
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Old 19-11-2012, 18:59   #19
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Re: Start bank fuse size?

It will help to do a little studying. Most the fuses used for this purpose are designed with a blow delay. They blow at the published rating but only after X time. Trip time of starter in rush is a short duration. The short term rating is much higher than the labeled rating. It can be confusing.

The trip time of the BS ANL 300A fuse is 900A, (300%) up to a full sec.
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Old 23-11-2012, 20:07   #20
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Re: Start bank fuse size?

Not fusing your starter would make as much sense as deciding not to have a circuit breaker for one of your big appliances, like a dryer at home because it was just too much current. The regulations are old, but there is a push to add an inline fuse in the starter circuit regulations. If you have ever seen what happens when a starter solenoid locks up, it isn't pretty, and the starter continues to heat up along with the battery cables and batteries until the weakest link melts, and sometimes across something that will burn. Go ahead and put a good size fuse in line. It's best to contact the engine manufacture and find out what the correct fuse would be. Buy the fuse with the most surface area to bolt to so there isn't much resistance at the connections. You can buy circuit breakers, but they are expensive. Mount the fuse with a cover so there is no chance of hitting it with a wrench to ground.

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