Underhood Ammeter Bypass

Electrical & Ignition

  1. Mike66Chryslers

    Mike66Chryslers Senior Member

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    Whatever you do, don't do this. :eek: This rewiring job was on a '51 Merc advertised in FB Marketplace. The seller claims that the previous owner paid someone $1500 to rewire the car for 12V to use with a Chevy 305 that they put in it. It looks like the inside of a pinball machine.

    upload_2021-11-24_14-49-22.png
     
  2. Bucket

    Bucket Member

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    The thing is they didn't try to sell me anything else .
    These blokes are all into cars and i have have known them for 20 + years.
    They told me they can't even buy fuseable links or wire anymore .
     
  3. Bucket

    Bucket Member

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    Thanks for this information .
    The car is a 1961 Newport , i am still trying to figure out the alternator output .
    The alternator has 2095191 on the front and twin pulleys .
    From what i can find this may have been a 60 amp .
    I have no idea if it has been re manufactured .
    From the wiring diagram in the FSM i can not see any fuseable links in the wiring loom .
    I may be missing something .
     
  4. Bucket

    Bucket Member

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    Thanks Big John , that's a handy graph
     
  5. Gerald Morris

    Gerald Morris Senior Member

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    Buy the WIRE, cut it to length, and make your own. Very easy. I certainly have NO TROUBLE obtaining fusible link wire. I suppose, given your location, things MAY DIFFER DOWN UNDER. Alas! I suppose you can order from the States, unless the Gov would BUST you for it? Would they go THAT FAR?

    If so, I say, its time to emigrate. I recall 30 yrs ago, I thought of heading your way, BUT THEN, I researched certain trends in Commonwealth countries, and decided to stay put, bad as that is. Bureaucrats amplified by microprocessors are really screwing the planet up, though they're hardly ALONE in THAT!

    Domine, miserere nobis!
     
  6. Bucket

    Bucket Member

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    The local parts shop has a 60amp Midi fuse .
    I have seen some other ones advertised as 1 way (direction?)
    Are they all 1 way and would this make a difference ?
     
  7. Gerald Morris

    Gerald Morris Senior Member

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    A one way midi fuse would direct over-current protection down to the elements, but not the current source. Midi fuses WERE designed as replacements for fusible links, so if you indeed can't get on the road any other way, then a midi fuse would probably be your closest substitute for them. Look at maxi-fuses also.

    I actually tried the latter in place of a fusible link 5 years ago, when I had what I thought were circuiting troubles. It turned out, I had a broken motor mount, and when I accelerated, the charging stud from the alternator would ground and short circuit! The fuses blew out TOO fast, even after replacing the motor mount, I found any sudden demand on the charging system had a way of popping maxi-fuses. This is why I took such a vehement tone at first regarding the suggestion from your mates at the auto supply.

    Design for worst case scenarios, and upgrade your charging circuit to #8 wire, with 80 amp midi fuses, and you might do well.
     
  8. USSMOPAR

    USSMOPAR Member

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    1972 Chrysler station wagons with the trailer towing package had a factory ammeter bypass. I owned a 9 passenger, brown, dual air, cruise control, pwr antenna, am fm, grab handles, bumper guards, cornering lights, 400, tinted glass, 3.23 sure grip 8-3/4.
     
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  9. cbarge

    cbarge World Famous Barge in a Budget FCBO Gold Member

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    Police cars with big alrernators also bypassed the bulkhead connector
     
  10. Ross Wooldridge

    Ross Wooldridge Senior Member FCBO Gold Member

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    My 66 Canadian 440 4-speed Monaco was special order built to police specs, and has a factory bulkhead bypass. Also had the high output alternator and adjustible regulator mounted on the inner fender...
     
  11. Yeahrightgreer

    Yeahrightgreer Senior Member

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    If you can, I would just order it in from the states like Gerald mentioned. Easiest solution in my opinion. Unless it is illegal to bring in for some reason. It's very cheap and readily available here in the states.