I have 71 E-Type OTS 4.2 2R 14507
Replacing the Alternator and the starter solenoid. Bosch Solenoid has the pins numbered but I can’t find anything that says what color wire goes to each pin. The five pins are in the same configuration as the blue Lucas solenoid. I put them carefully, tranferring one at a time to the new solenoid … only to have the starter engage when I hook up the battery … even though the key is OFF. ??
The solonid wire that engages the starter only has power when you turn the key. Check the wires while unhooked with a voltmeter there should be only one wire that gets hot.
Five Wires on the Starter Solenoid. Two are larger gage. WB which I believe goes to the ignition and N that goes to the Starter. They are on 87 and 87A posts. Does it matter which is on which? I have tried both ways with no difference … still wants to start when connecting the battery? Pos Bat Cables goes to Post. Several N wires connected to Post also. Is the Post hot on both sides. It looks like it is a threaded bolt that goes through a nylon piece in the middle. The is BOTH sides of the post hot? Could my problem be that both sides of the Post are NOT the same and I have something connected to the hot side that should not be?
Hello Jay:
First off, your 1st post so a big welcome to Jag-lovers. 
I’ll assume from your reference to “pins” that you may actually be referring to the starter relay and not the starter solenoid. If so, here’s a diagram of Lucas to Bosch Relay Terminal Mapping by J-L member @ Michael_Frank (aka Mr. Coolcat) that should help: temp14
Helpful I think? Little Bosch diagram with terminal defs helps. If I read this right. The little black square “relay” is what my new unit looks like. THe old Lucas (#33365E) was about the size of a cylindrical flasher unit … is sky blue with all the same numbers. My wiring is clean and readable … but I don’t know which wire goes to which number. The numbers were the same and in the same position.
I currently have on the Black Bosch square “relay”:
30 - WU
85 - WY
86 - B
87 - N
87a - WR
Is there anything via a diagram that give the wire colors to the positions?
Jay,
Welcome to the forum! It seems that you have the incorrect sort of relay. The starter relay on your 1971 Series 2, is a two pole relay, not a single pole changeover relay. This is how it fits into the circuit:
Under all conditions except when the ignition switch is in the crank position, the relay is inactive, and C1 (White/Blue) and C4 (White/Red) are not connected to C2 (Brown - always hot). When the Ignition switch is in the crank position, the WY wire is energized causing the relay to activate. This causes C2 to connect to both C1 and C4, so the power goes to the ignition coil (WU) and the starter solenoid (WR). If you want to use a Bosch DIN style relay, you need to find a two pole version.
Jay David took care of what I was going to send you, the wiring diag. As you can see the white red wire is you solenoid wire. I think you can still buy the correct starter solenoid relay. I like to keep things original…
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So here’s a better diagram. Note that this is a special double contact relay. It can’t be replaced by a changeover relay:
You’re trying to replace it with a changeover relay, which looks like this. Notice that either 87 or 87a will be hot, but never both at once:
There are “Bosch” relays that have two 87 throws, that’s what you would need.
So … I replaced a Lucas 33365E with the Bosch unit … only because no one had the Lucas available. Do I need to FIND that unit or does Bosch make a compatible unit. This diagram uses the number 33231 Relay … is that the specific unit I need to locate?
The blue can 33365 relay must have been a replacement some time in the past. It appears to have originally been used in Triumphs - never used on the E-Type.
Bosch, no doubt, makes a Double Contact relay that could be used as a substitute. However, I don’t have a part number, or the knowledge to determine which of their range would be suitable.
You may not be able to find a new 33231 any more. However, SNG Barratt does sell a substitute from the 22RA family (the 33231 is from the 6RA family) which is a direct replacement:
https://forums.jag-lovers.com/u/michael_frank Michael_Frank Patron
November 21
Series 2, is a two pole relay, not a single pole changeover relay.
So here’s a better diagram. Note that this is a special double contact relay. It can’t be replaced by a changeover relay:
https://discourse-cdn.jag-lovers.com/original/3X/d/8/d852c95c40dd2c1090e03a0181a539a811b3b0eb.jpeg
You’re trying to replace it with a changeover relay, which looks like this. Notice that either 87 or 87a will be hot, but never both at once:
There are “Bosch” relays that have two 87 throws, that’s what you would need.