nappypappy's Avatar
Mon 27 Sep - 07:47
Geno's Avatar
Geno : Morning all :chill
Mon 27 Sep - 07:37
nappypappy's Avatar
Sun 26 Sep - 09:14
GT 14's Avatar
GT 14 : Morning :yes
Sat 25 Sep - 09:27
nappypappy's Avatar
Sat 25 Sep - 08:59
Geno's Avatar
Geno : Happy weekend all :clap
Sat 25 Sep - 07:46
nappypappy's Avatar
Fri 24 Sep - 09:09
Geno's Avatar
Geno : Morning all :sun
Fri 24 Sep - 07:28
GT 14's Avatar
GT 14 : Morning :wrain
Thu 23 Sep - 09:17
nappypappy's Avatar
Thu 23 Sep - 08:19
Geno's Avatar
Geno : Morning all :spock
Thu 23 Sep - 07:21
Geno's Avatar
Geno : Morning all :c2
Wed 22 Sep - 07:55
nappypappy's Avatar
nappypappy : morning:wrain
Wed 22 Sep - 05:36
nappypappy's Avatar
Tue 21 Sep - 09:16
Geno's Avatar
Geno : Morning all :wrain
Tue 21 Sep - 08:42
Geno's Avatar
Geno : Morning all :chill
Mon 20 Sep - 07:33
nappypappy's Avatar
Mon 20 Sep - 06:28
nappypappy's Avatar
Sun 19 Sep - 10:01
GT 14's Avatar
GT 14 : Morning :c1
Sun 19 Sep - 08:16
Geno's Avatar
Geno : Happy weekend all :clap
Sat 18 Sep - 07:24
nappypappy's Avatar
nappypappy : Morning :th7
Sat 18 Sep - 06:27
nappypappy's Avatar
Fri 17 Sep - 08:24
Geno's Avatar
Geno : Morning all :spock
Fri 17 Sep - 07:39
GT 14's Avatar
GT 14 : Morning :th7
Thu 16 Sep - 10:00
Geno's Avatar
Geno : Morning all :th7
Thu 16 Sep - 07:50
nappypappy's Avatar
Thu 16 Sep - 06:41
GT 14's Avatar
GT 14 : Afternoon :lol
Wed 15 Sep - 13:27
Geno's Avatar
Geno : Morning all :wrain
Wed 15 Sep - 07:34
nappypappy's Avatar
nappypappy : morning :c2
Wed 15 Sep - 06:36
nappypappy's Avatar
Tue 14 Sep - 08:22
Geno's Avatar
Geno : Morning all :sun
Tue 14 Sep - 07:35
nappypappy's Avatar
Mon 13 Sep - 09:25
Geno's Avatar
Geno : Morning all :chill
Mon 13 Sep - 07:39
nappypappy's Avatar
Sun 12 Sep - 10:39
Geno's Avatar
Geno : Happy weekend all :clap
Sat 11 Sep - 07:59
nappypappy's Avatar
Sat 11 Sep - 04:58
GT 14's Avatar
GT 14 : Morning :th7
Fri 10 Sep - 09:31
Geno's Avatar
Geno : Morning all :wsun
Fri 10 Sep - 07:19
nappypappy's Avatar
nappypappy : :c2 morning
Fri 10 Sep - 06:32
GT 14's Avatar
GT 14 : Morning :th7
Thu 9 Sep - 11:33
nappypappy's Avatar
Thu 9 Sep - 07:33
Geno's Avatar
Geno : Morning all :sun
Thu 9 Sep - 07:24
GT 14's Avatar
GT 14 : Morning :yes
Wed 8 Sep - 10:27
nappypappy's Avatar
Wed 8 Sep - 09:32
Geno's Avatar
Geno : Morning all :spock
Wed 8 Sep - 07:30
GT 14's Avatar
GT 14 : Morning :th7
Tue 7 Sep - 11:42
Geno's Avatar
Geno : Morning all :wsun
Tue 7 Sep - 07:46
nappypappy's Avatar
nappypappy : :c2:hello morning
Tue 7 Sep - 06:53
Geno's Avatar
Geno : Morning all :sun
Mon 6 Sep - 07:53
nappypappy's Avatar
Mon 6 Sep - 07:34

Please log in to post and use the shoutbox.

×
WHS Site and Forum Registration. (16 May 2021)

If you would like to become a member give me a call. Thanks! :thumb1

Tecumseh Charging System

  • M Bailey
  • M Bailey's Avatar Topic Author
  • Offline
  • Supporter
  • Supporter
  • Posts: 658
  • Thank you received: 116

M Bailey created the topic: Tecumseh Charging System

The 3 amp charging system used on many of the H and V series engines is composed of a center tapped alternator which produces 24~35 volts AC depending on engine rpm. Full wave rectification is achieved by grounding the center tap and using diodes on either side of the center tap thus producing 12~18 volts on either side of the center tap (ground). The B+ output of these diodes PN# 30842/36909 are parallel connected to a 6 amp fuse which connects directly to the positive battery lead. The system has NO regulation. A little more background on the diodes used in the system, they are actually 1N1081 fuse holder type diodes rated at .5 amp forward current which means that there is no way possible for this system to charge at the rated 3 amps. Couple the low current capability of the diodes with the 6 amp fuse and suddenly the rectifier becomes the fuse! In the case of the H-60 on my 654 the PO decided on a 25 amp fuse, a bad call resulting in 2 blown diodes. A good diode should have continuity in one direction and not the other.

H-60 rectifier/fuse panel



In the event you need to replace your diodes, check for the correct value fuse and do a search for 1N1081 diodes (1N1081 through 1N1084 are compatible, the higher numbers having a higher peak voltage rating) which can still be found and are much cheaper than the Tecumseh part number.


Major


"I refuse to join any club that would have me as a member." Groucho Marx
#1
Attachments:
The following user(s) said Thank You: Geno

Please Log in to join the conversation.

  • Geno
  • Geno's Avatar
  • Online
  • Administrator
  • Administrator
  • Wheel Horse Stables Owner
  • Posts: 5503
  • Thank you received: 666

Geno replied the topic: Tecumseh Charging System

Very nice! :goodjob


Welcome to the Stables!
#2

Please Log in to join the conversation.

  • AJ WH Ranger
  • AJ WH Ranger's Avatar
  • Offline
  • Super Mod - Supporter
  • Super Mod - Supporter
  • Posts: 476
  • Thank you received: 60

AJ WH Ranger replied the topic: Tecumseh Charging System

So with a steady hand, correct diodes and a soldering iron....

You can replace those god awful expensive fuse type diodes with a couple 75 cent diodes..


AJ
Bassin' and Horsin' around!

66 Lawn Ranger
68 Lawn Ranger
72 Charger 10 auto
74 C-100 8-Speed
81 C-101 Blackhood
#3

Please Log in to join the conversation.

  • M Bailey
  • M Bailey's Avatar Topic Author
  • Offline
  • Supporter
  • Supporter
  • Posts: 658
  • Thank you received: 116

M Bailey replied the topic: Tecumseh Charging System

AJ WH Ranger wrote: So with a steady hand, correct diodes and a soldering iron....

You can replace those god awful expensive fuse type diodes with a couple 75 cent diodes..


You got it AJ, I silver soldered in a couple of these... HER602, 6 amp


Even a 1N4001 1 amp would be an improvement.


Major


"I refuse to join any club that would have me as a member." Groucho Marx
#4
Attachments:
The following user(s) said Thank You: AJ WH Ranger

Please Log in to join the conversation.

  • AJ WH Ranger
  • AJ WH Ranger's Avatar
  • Offline
  • Super Mod - Supporter
  • Super Mod - Supporter
  • Posts: 476
  • Thank you received: 60

AJ WH Ranger replied the topic: Tecumseh Charging System

Yes Nailed it!

The only difference with those is the VF (forward voltage) which is just slightly under the original 1.5v coming in at 1.2v.

But on something like this.. That .3v will not be missed at all as long as the engine maintains at 6 amp. Because the VF (I believe) will decrease with a drop in current..

Edit...

I was completely on the wrong semiconductor... Forget what I said.. I will leave it up so people can read my mistake...

A diodes VF (forward voltage) is it switching on voltage... Nothing what like what I said below... Which also brings up another point Major. If the IF is not at the rated 6 amps, what will the VF actually be at? I doubt it follows a linear path as most diodes don't.


AJ
Bassin' and Horsin' around!

66 Lawn Ranger
68 Lawn Ranger
72 Charger 10 auto
74 C-100 8-Speed
81 C-101 Blackhood
#5

Please Log in to join the conversation.

  • M Bailey
  • M Bailey's Avatar Topic Author
  • Offline
  • Supporter
  • Supporter
  • Posts: 658
  • Thank you received: 116

M Bailey replied the topic: Tecumseh Charging System

AJ WH Ranger wrote: Yes Nailed it!

The only difference with those is the VF (forward voltage) which is just slightly under the original 1.5v coming in at 1.2v.

But on something like this.. That .3v will not be missed at all as long as the engine maintains at 6 amp. Because the VF (I believe) will decrease with a drop in current..

Edit...

I was completely on the wrong semiconductor... Forget what I said.. I will leave it up so people can read my mistake...

A diodes VF (forward voltage) is it switching on voltage... Nothing what like what I said below... Which also brings up another point Major. If the IF is not at the rated 6 amps, what will the VF actually be at? I doubt it follows a linear path as most diodes don't.


AJ, according to the HER602 graph, at 3 amps (alternator output max) the Vf is .8 increasing to 1.0 at the rated 6 amp max.


Major


"I refuse to join any club that would have me as a member." Groucho Marx
#6

Please Log in to join the conversation.

Time to create page: 1.625 seconds