|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
02-21-2022, 01:48 AM | #21 |
Senior Member
Join Date: Jul 2011
Location: SF Bay Area
Posts: 6,635
|
Re: what size diode do I need
[QUOTE=34PKUP;2106619]I see what your confusion is. This diagram is not complete, as it is intended only to show the bypass circuit, and not the normal ignition circuit. The circuit you see here is only active during the time the starter is energized.
__________________
Alan |
02-21-2022, 02:09 AM | #22 |
Senior Member
Join Date: Jul 2011
Location: SF Bay Area
Posts: 6,635
|
Re: what size diode do I need
[QUOTE=34PKUP;2106619]I see what your confusion is. That diagram is not complete, as it is intended only to show the bypass circuit, not the normal ignition circuit. The circuit you see here is only active during the time the starter is energized.
__________________
Alan |
Sponsored Links (Register now to hide all advertisements) |
|
02-21-2022, 02:41 AM | #23 | |
Senior Member
Join Date: May 2010
Location: so cal, placerville, vegas
Posts: 1,394
|
Re: what size diode do I need
Quote:
And, by the way, I believe the diode is drawn backwards (for 6V positive ground), as indicated in some of the above posts. I make the assumption that if messing with this stuff, one can figure out which way to put the diode. And, on another note, of course Mart is correct regarding the relay. A relay could do this job, also. (If the diode is put in backwards, you will NOT get battery voltage to the coil. And, worse, you will get coil voltage trying to run the starter when the car is trying to run. The car might not start, and if it does, the resistor circuit will probably eventually burn up. I'm pretty sure the starter would survive this. My opinion, don't mess with this if you are unsure.) |
|
02-21-2022, 05:59 AM | #24 | |
Senior Member
Join Date: Aug 2020
Posts: 142
|
Re: what size diode do I need
Quote:
|
|
02-21-2022, 02:10 PM | #25 |
Junior Member
Join Date: Nov 2011
Posts: 3
|
Re: what size diode do I need
The 9N tractor like the cars used a wire wound resistor, when cold the resistance is low so more current flows to the points. As the current flows through after about 2 minutes the wire gets hot and the resistance changes, getting higher, reducing the current flow to the points.
Doesn't the original system already accomplish what this bypass does? |
02-21-2022, 02:49 PM | #26 |
Senior Member
Join Date: Mar 2014
Location: Jacksonville FL
Posts: 3,946
|
Re: what size diode do I need
Sponsored Links (Register now to hide all advertisements)
MART and everyone else that "HAS NEVER HAD TO DO....." Let me go through this ONE more time. I am working on a Ford GP Jeep (Effectively a "proto type vehicle). There were many issues with these jeeps....ONE being ground issues!!! IT only has one ground strap from the body to the frame ORIGINALLY. I am working on adding a couple of more BUT until then.....I would like to at least get it running. IT is "basically" a Ford 9N tractor motor. IT is a fresh rebuilt motor SO it is "somewhat" of a tight motor. The starter is turning the motor BUT it is somewhat slow, Initially, then gets real slow real fast!!!! IT is a supposed rebuilt Ford starter....NOT sure IF it is the issue or NOT....trying to assess that now and IF not then why the drop to my coil........IF i can get it running with a jumper THEN I have also narrowed down my area of focus!!!! I Believe a by product of this IS a voltage drop to the coil AS even when it is spinning "somewhat" slow, I have NO spark at the plugs!!!! NEW...coil, points, condenser, optima battery, carburetor, I have re-re-did the distributor. I would LIKE to get this thing "running" and broke in BEFORE I continue to find & refine the inherent issues with these limited production vehicles!!!! Last edited by rockfla; 02-21-2022 at 02:59 PM. |
02-21-2022, 03:21 PM | #27 |
Senior Member
Join Date: May 2015
Posts: 8,076
|
Re: what size diode do I need
This "hot wire" ckt. is especially useful when you have a weak battery...
__________________
The only thing nice about being imperfect is the joy it brings to others.... "Silver rings, your butt! Them's washers!" "We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969 https://www.youtube.com/watch?v=7NReUd2_0u0 |
02-21-2022, 03:28 PM | #28 | |
Senior Member
Join Date: Mar 2014
Location: Jacksonville FL
Posts: 3,946
|
Re: what size diode do I need
Quote:
My Optima is up to 6.4V. It seems to "initially" spin the motor a little better SO my plan IS to use it in conjunction with my wet cell via jumper cables for starting.....I've pulled my battery out of the Mercury for my "jumper" power source AND IF need be I have a 12V battery I can swap my jumper cables to and go directly to the starter with that to get it spinning!!! Thoughts??? |
|
02-21-2022, 03:34 PM | #29 |
Senior Member
Join Date: May 2015
Posts: 8,076
|
Re: what size diode do I need
When Nick Alexander sold his Woodie Fleet back in 2009 at Monterey, many of them would not start. His mechanics crew would apply 12 volts directly to the starters of the cars that would not start to fire them up....
__________________
The only thing nice about being imperfect is the joy it brings to others.... "Silver rings, your butt! Them's washers!" "We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969 https://www.youtube.com/watch?v=7NReUd2_0u0 |
02-21-2022, 03:42 PM | #30 | |
Senior Member
Join Date: May 2010
Location: so cal, placerville, vegas
Posts: 1,394
|
Re: what size diode do I need
Quote:
In your case, my opinion is, forget all the stuff you are trying, and go directly to 12V, like Pete has suggested, and I am also suggesting with this post. Last edited by bobH; 02-21-2022 at 03:47 PM. |
|
02-21-2022, 03:56 PM | #31 |
Senior Member
Join Date: Mar 2014
Location: Jacksonville FL
Posts: 3,946
|
Re: what size diode do I need
BobH
Like you, at one time...We had 15 GPW's, 2 GPA's, 2 Willys Slat Grills, M38, m38A1, 3 M151's a Harley WLA and 2 GP's..... SO we know "JEEPS" ...... This one is a challenge to say the least!!! |
02-21-2022, 03:58 PM | #32 |
Senior Member
Join Date: May 2010
Posts: 2,173
|
Re: what size diode do I need
>>>I've pulled my battery out of the Mercury>>>>>>Thoughts???>>>
(1) Put the battery back. (2) Tie rope between Jeep & Merc. (3) Ask wife to tow you around block in Jeep. No diodes. No relays. No jumpers. No starters. Simple. 8^) |
02-21-2022, 04:01 PM | #33 |
Senior Member
Join Date: May 2010
Location: so cal, placerville, vegas
Posts: 1,394
|
Re: what size diode do I need
Right on !!!! My opinion, get this thing spinning and running first. Later, figure out how you want to wire it.
|
02-21-2022, 04:05 PM | #34 | |
Senior Member
Join Date: Mar 2014
Location: Jacksonville FL
Posts: 3,946
|
Re: what size diode do I need
Quote:
I Need to make sure I have fire at the plugs....IF i knew that I would have already done the step above!!! NO sparky NO runny!!! |
|
02-21-2022, 04:07 PM | #35 |
Senior Member
Join Date: May 2010
Location: Solihull, England.
Posts: 8,745
|
Re: what size diode do I need
If you have 2 batteries use one (12V if possible) to turn the motor and an independently wired 6V job for the ignition (direct if only to run for a short time.
A spark at the right time, compression and some fuel down the carb should get it going. I'm not sure what the "NEVER HAD TO DO" comment means but as someone who "ALWAYS HAS TO DO" I'm not sure I like it. Mart. |
02-21-2022, 04:09 PM | #36 |
Senior Member
Join Date: May 2010
Location: Solihull, England.
Posts: 8,745
|
Re: what size diode do I need
Do you have a spark if you just open and close the points manually? Poke them with a screwdriver and have the king lead from the coil held near the head.
You're right. Ensure spark first. It doesn't have to be turning to do that. Mart. |
02-21-2022, 04:13 PM | #37 |
Senior Member
Join Date: Mar 2014
Location: Jacksonville FL
Posts: 3,946
|
Re: what size diode do I need
I can do that tonight!!! Thanks Mart, I didn't think about that!!!
|
02-21-2022, 07:32 PM | #38 |
Member
Join Date: May 2010
Posts: 73
|
Re: what size diode do I need
10 amp 450 piv diode should do it 36fordguy
|
02-21-2022, 08:16 PM | #39 |
Senior Member
Join Date: Jan 2011
Location: sw minnesota
Posts: 4,567
|
Re: what size diode do I need
Jeeps are swell ! I kinda feel inferior to you guy's as I have only had 4, 2 MB's, 2 M38's. The current M38 is a keeper, nice clean original except paint. Now, I have to agree with many here, get it spinning with 12 volts, check spark, and fire that mother up
|
02-23-2022, 02:11 PM | #40 |
Senior Member
Join Date: Mar 2011
Location: upstate NY
Posts: 478
|
Re: what size diode do I need
I know Rockfla said ONE more time, but it's been bugging me. I understand the concept of bypassing the resistor wire or ballast with a jumper. But how is voltage maintained at the coil? The battery voltage is going to be drawn down with the load when the starter is engaged. A diode isn't going to maintain it at 6volts.
Lets say your battery reads 6.4 volts no load.Hit the starter button, starter engages. The battery is going to read say for argument sake 5.9 volts. The coil is going to see 5.9 volts. A DuckDuckGo search, I don't use goggle anymore, did not show any results. |
|
|
Sponsored Links (Register now to hide all advertisements) |
|